I know it's probably just a bandaid, but how much weight do you think you could carve off those pistons?
I know some of the old "stock" class drag engines used what started out as stock pistons, but had a bunch removed from them (I've heard as much as 2/3 of their orriginal mass being carved off).
Lightening the pistons, AND running a thinner wall (or tapered bore) wrist pin is bound to help, but I would lighten the pistons first.
