Originally Posted by Sydewynder

I would try different tires in the rear. A slicks if that's what you are using is Tamiya's softest ones. Best this to do is check what your fast guys at the track are using. I guess ask Ivan.
The reason some have suggested more rear droop is to give more weight transfer to the front off power coming into a turn.
I would try higher rear ride height than the front and see if that helps with you push.
On my shocks, (Al ones) the shockends can wiggle on the balls to avoid binding. Using step screws to mount the shocks, still should be loose enough to avoid binding. If there is a lot of up down slop then are the plastic end holes worn and now too big?