Great process. One thing I would add: look at your speed trace consistency across laps, not just your fastest vs. average. If your minimum corner speed varies by more than 3-4 mph from lap to lap at the same corner, that tells you the corner is not "solved" yet — your approach is inconsistent. For me at Mid-Ohio, Turn 4 (the keyhole) showed huge variation because I was not using a consistent brake marker. Once I picked a fixed reference point and committed to it, my consistency improved dramatically and my average lap time dropped even though my outright fastest lap was about the same.
The "one thing per session" discipline is the hardest but most important part. I used to look at data and make a list of five things to fix, then go out and be slower because I was thinking about all five simultaneously. Now I pick the single highest-value improvement — usually the corner where the time delta to my best lap is largest — and I focus exclusively on that. Everything else stays the same. Over a weekend of six sessions, that means I address six specific improvements with full attention rather than thirty improvements with divided attention. The compound effect is significant.
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