Knock sensors work just fine, and frankly in the ESC system it's the module that has the most say, not the sensors. I can easily replicate the exact pattern on the knock map by messing with timing step by step. Pulling the advance back to stock resolved the issue. Better fuel would too, but that's not an option here in Commiefornia unless I wanna pay $10/gallon for 100-octane, which I don't.
Stock '95:
https://i.imgur.com/llQvpOa.jpg
Advanced 37~39 degrees:
https://i.imgur.com/lVb5hRn.jpg
Also this is still a thread about Highway Lean Cruise for the LT1 PCM. So I'm still interested in that magical tune Fast355 is talking about, or a patch to add this type of function to the PCM. Don't want to drag stuff too far off topic.
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