RE: Botteming out after jumps..
I believe there are also "long throw" suspension thingamabobs, whatever their called on the revo, the things that pivot between the springs and the suspension rods. their longer so you can get more range of motion from the suspension.
guy at the track was running them thinking they were helping his handling, he switched back and shaved atleast 5 seconds off his lap times instantly. but Id imagine for bashing that extra travel might let you raise the ride hieght even more and could help you out.