Caltrac’s and high rpm doesn’t mix

Try the lower hole on the front spring mount bracket. It will lower the IC. The rear ride height will increase which might make the IC change a wash, but worth a shot. You may need lower ride height rear springs. I would also loosen the rear shock extension a lot. The car has no separation on leave. The front end doesn't appear to have much travel either. Needs 5" or more of front travel. Caltrac Abody cars have to be one of the most unforgiving suspensions ever. The 20" front spring segment makes the IC WAY TOO SHORT, which is the root cause of the issues people have. Nobody in their right mind would build a 20" ladder bar or have their 4 link intersect at 20" for the same reasons.
I agree with loosening the rebound but
Won’t that allow the tire to be hit harder?