diff --git a/.gitignore b/.gitignore
index e9deaa0b10..7a24d07c6f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -215,3 +215,4 @@ log.txt
 setup_leo.sh
 server.pid
 *.log
+package-lock.json
diff --git a/studio/backend/core/data_recipe/oxc-validator/package-lock.json b/studio/backend/core/data_recipe/oxc-validator/package-lock.json
deleted file mode 100644
index 0e16cc4187..0000000000
--- a/studio/backend/core/data_recipe/oxc-validator/package-lock.json
+++ /dev/null
@@ -1,794 +0,0 @@
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diff --git a/studio/backend/core/inference/llama_cpp.py b/studio/backend/core/inference/llama_cpp.py
index 42cce3c4d8..5d67500928 100644
--- a/studio/backend/core/inference/llama_cpp.py
+++ b/studio/backend/core/inference/llama_cpp.py
@@ -366,7 +366,7 @@ class LlamaCppBackend:
                 line = line.rstrip()
                 if line:
                     self._stdout_lines.append(line)
-                    logger.info(f"[llama-server] {line}")
+                    logger.debug(f"[llama-server] {line}")
         except (ValueError, OSError):
             # Pipe closed — process is terminating
             pass
@@ -500,13 +500,14 @@ class LlamaCppBackend:
         except Exception as e:
             logger.warning(f"Could not check disk space: {e}")
 
-        logger.info(
-            f"Downloading GGUF: {hf_repo}/{gguf_filename}"
-            + (f" (+{len(gguf_extra_shards)} shards)" if gguf_extra_shards else "")
+        gguf_label = f"{hf_repo}/{gguf_filename}" + (
+            f" (+{len(gguf_extra_shards)} shards)" if gguf_extra_shards else ""
         )
+        logger.info(f"Resolving GGUF: {gguf_label}")
         try:
             if self._cancel_event.is_set():
                 raise RuntimeError("Cancelled")
+            dl_start = time.monotonic()
             local_path = hf_hub_download(
                 repo_id = hf_repo,
                 filename = gguf_filename,
@@ -515,7 +516,7 @@ class LlamaCppBackend:
             for shard in gguf_extra_shards:
                 if self._cancel_event.is_set():
                     raise RuntimeError("Cancelled")
-                logger.info(f"Downloading GGUF shard: {shard}")
+                logger.info(f"Resolving GGUF shard: {shard}")
                 hf_hub_download(
                     repo_id = hf_repo,
                     filename = shard,
@@ -532,7 +533,11 @@ class LlamaCppBackend:
                 f"Failed to download GGUF file '{gguf_filename}' from {hf_repo}: {e}"
             )
 
-        logger.info(f"GGUF downloaded to: {local_path}")
+        dl_elapsed = time.monotonic() - dl_start
+        if dl_elapsed < 2.0:
+            logger.info(f"GGUF resolved from cache: {local_path}")
+        else:
+            logger.info(f"GGUF downloaded in {dl_elapsed:.1f}s: {local_path}")
         return local_path
 
     def _download_mmproj(
diff --git a/studio/backend/utils/datasets/llm_assist.py b/studio/backend/utils/datasets/llm_assist.py
index c5892bfbc2..5012c8ba07 100644
--- a/studio/backend/utils/datasets/llm_assist.py
+++ b/studio/backend/utils/datasets/llm_assist.py
@@ -22,14 +22,40 @@ import time
 from itertools import islice
 from typing import Any, Optional
 
-logger = logging.getLogger(__name__)
+from loggers import get_logger
 
-DEFAULT_HELPER_MODEL_REPO = "Qwen/Qwen2.5-7B-Instruct-GGUF"
-DEFAULT_HELPER_MODEL_VARIANT = "Q8_0"
+logger = get_logger(__name__)
+
+DEFAULT_HELPER_MODEL_REPO = "unsloth/Qwen3-4B-Instruct-2507-GGUF"
+DEFAULT_HELPER_MODEL_VARIANT = "UD-Q4_K_XL"
 
 README_MAX_CHARS = 1500
 
 
+def _strip_think_tags(text: str) -> str:
+    """Strip <think>...</think> reasoning blocks emitted by some models.
+
+    If the model places its actual answer OUTSIDE the think block, we
+    discard the think block and keep the rest.  If the entire response
+    is INSIDE a think block (nothing useful outside), we extract and
+    return the inner content instead of discarding everything.
+    """
+    if "<think>" not in text:
+        return text
+
+    # Try stripping think blocks — keep content outside them
+    stripped = re.sub(r"<think>.*?</think>\s*", "", text, flags = re.DOTALL).strip()
+    if stripped:
+        return stripped
+
+    # Everything was inside <think> tags — extract the inner content of the last block
+    matches = re.findall(r"<think>(.*?)</think>", text, flags = re.DOTALL)
+    if matches:
+        return matches[-1].strip()
+
+    return text
+
+
 def precache_helper_gguf():
     """
     Pre-download the helper GGUF to HF cache.
@@ -129,6 +155,7 @@ def _run_with_helper(prompt: str, max_tokens: int = 256) -> Optional[str]:
             cumulative = text  # cumulative — last value is full text
 
         result = cumulative.strip()
+        result = _strip_think_tags(result)
         logger.info(f"Helper model response ({len(result)} chars)")
         return result if result else None
 
@@ -399,7 +426,9 @@ def _generate_with_backend(backend, messages: list[dict], max_tokens: int = 512)
         repetition_penalty = 1.0,
     ):
         cumulative = text
-    return cumulative.strip()
+    result = cumulative.strip()
+    result = _strip_think_tags(result)
+    return result
 
 
 def fetch_hf_dataset_card(
diff --git a/studio/frontend/src/features/studio/sections/dataset-preview-dialog-mapping.tsx b/studio/frontend/src/features/studio/sections/dataset-preview-dialog-mapping.tsx
index ed00caf7be..4a99c4f702 100644
--- a/studio/frontend/src/features/studio/sections/dataset-preview-dialog-mapping.tsx
+++ b/studio/frontend/src/features/studio/sections/dataset-preview-dialog-mapping.tsx
@@ -155,7 +155,7 @@ export function DatasetMappingCard({
         <div className="min-w-0">
           <p className="text-sm font-semibold tracking-tight">
             {mappingOk
-              ? autoDetected ? "Auto-detected mapping" : "Mapping ready"
+              ? autoDetected ? "Heuristic-detected mapping" : "Mapping ready"
               : "Map dataset columns"}
           </p>
           <p
@@ -168,7 +168,7 @@ export function DatasetMappingCard({
           >
             {mappingOk
               ? autoDetected
-                ? "We auto-detected the column mapping below. You can change it using the dropdowns in the column headers, or use AI Assist for a smarter mapping strategy."
+                ? "We auto-detected the column mapping below using heuristics. Please review and adjust using the dropdowns in the column headers, or use AI Assist for a smarter mapping."
                 : "Looks good. We'll convert this dataset automatically."
               : `Assign roles to columns using the dropdowns in the headers. At minimum, assign ${requiredLabel}.`}
           </p>
diff --git a/studio/frontend/src/features/training/hooks/use-training-actions.ts b/studio/frontend/src/features/training/hooks/use-training-actions.ts
index e42bc2c962..b5b41e7a0d 100644
--- a/studio/frontend/src/features/training/hooks/use-training-actions.ts
+++ b/studio/frontend/src/features/training/hooks/use-training-actions.ts
@@ -78,7 +78,8 @@ export function useTrainingActions() {
           });
         }
 
-        if (check.requires_manual_mapping && !hasManualMapping(config, isVlm, isAudio)) {
+        const needsReview = check.requires_manual_mapping || check.detected_format === "custom_heuristic";
+        if (needsReview && !hasManualMapping(config, isVlm, isAudio)) {
           // Pre-fill from suggested_mapping or VLM detected columns
           const hint: Record<string, string> = {};
           if (check.suggested_mapping) {