If you "tuned dozens of cars" then I'm sure you know what synchronizing the timing is and why is done. You keep ignoring the fact that the ECU uses 10 degrees base timing for its calculations and advancing it is not recommended period. There is nothing magical, just pure facts that you keep ignoring or shrugging off.I’ve tuned dozens of cars. Ignition timing is ignition timing. If you think there’s something magical about what’s programmed into a stock early 90s ECU, well, I don’t even know why you’re modifying your car.
True statement - Generally hotter cams want a tad more ignition timing at the same mass flow due to many factors. Easiest way to do this with a stock ECU is bump up your base timing a tad. Verify things still work well after you do this (no knock, you actually gained power etc).