Tuning For Detonation

Weld the inside of the slots and timing looks like this
Versus welding the outside of the slots which would result in a curve like this assuming the engine will idle down at 700 rpm.
upload_2021-4-30_16-45-12.png
Basically the same issues and solutions as when using the limiter plate.
What you might try in this case is to add a second primary spring instead of the long looped spring.