Also consider that in lower load areas you could advance past MBT and lose power. My advice would be to pull out timing at WOT to resolve where it's pulling timing and leave it at that.
General rule of thumb is to have the minimum timing needed to make the torque for any given situation. You can't really calculate MBT without a dyno and TBH does it matter that much when not WOT?
This ECU does it's ignition maps in 0.35 deg steps.
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