I run 53% rear as well, but we don't have much HP. Probably somewhere in the 450 range. And we do just fine with 53%. But I can imagine with a stronger motor, you will need more rear %. Try scaling the car with the amount of fuel it will have at the end of the feature. And put your rear % at 55.
Crew Chief "Tip of the day":
Most handling problems can be solved by adjusting the screw-ball. It can be difficult to fine tune at times. Explaining yourself loudly and striking it on top of the helmet with a dead blow hammer usually works well.
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