improve chroma base

configs/CHROMA_BASE.knf.yaml

@@ -266,9 +266,9 @@ training:
       validation_prompt_library: false # Disable SimpleTuner built-in prompt library.
       validation_disable_unconditional: true # Skip unconditional validation branch.
       validation_resolution: 512x512     # Keep Base validation at native Chroma/Flux image size.
-      validation_num_inference_steps: 24     # Full-run validation sampling steps.
-      validation_guidance: 1.0               # CFG guidance used by validation.
-      validation_guidance_real: 2.5          # Chroma/flow guidance-real default.
+      validation_num_inference_steps: 40     # Full-run validation sampling steps.
+      validation_guidance: 3               # CFG guidance used by validation.
+      validation_guidance_real: 3          # Chroma/flow guidance-real default.
       validation_guidance_rescale: 0.0       # Guidance rescale; 0 disables rescale.
       validation_seed: 42                    # Deterministic validation seed.
       num_eval_images: 1                     # Images per validation prompt.