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To prevent the dynamic advance adding timing above the base ignition map setpoint you can try the following methods,
Use The RaceROM disable for Dynamic advance map
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Prevent it from swapping to low octane mode by setting the low octane judgment threshold very low.
Set the high and low octane 1D’s to the same value so when it swaps into low octane mode and calculates the drop in octane (octane estimate – octane setpoint) it doesn’t have a positive offset to octane drop/difference calculation.
Use the Dynamic Advance Limit (octane max) to prevent the ECU trying to add timing above an octane amount