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PolarQuant.dequantize() now re-normalizes reconstructed rotated coordinates to unit norm before inverse rotation, matching the production llama.cpp grp_norm / recon_norm correction. On Qwen2.5-3B, this drops 4-bit PPL from 19.39 to 8.47 (near-lossless) and 3-bit from 1369 to 70.6. No regression on TinyLlama or Mistral. Includes benchmark scripts for TQ vs IsoQuant/RotorQuant comparison and norm correction A/B testing. Co-Authored-By: tturney@psyguard.ai Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>