Pinging B$@&%@rd 440!

You said you can feel the difference…….. cylinder pressure is where that comes from.

Currently you don’t have enough octane for the conditions that exist when you bury the pedal into the carpet.

Either raise the octane, or change the octane requirement……… or put some sort of throttle limiter on the pedal.
oh man that sucks. I have been getting ready to buy some 84cc aluminum heads for this thing and thats going to raise compression even more and probably make this worse! Unless being closed chamber would help for some reason or other?