Controller oscillated: 3 dones at step 15k spiked EMA above 2×target, triggering thousands of steps of tightening that killed trades. Higher target (10% vs 2%) matches the natural trade frequency at b=16. Wider dead zone (5× above / 0.2× below) prevents single-batch spikes from triggering tighten/relax oscillation. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>