Theres a few of things you can do to make it better over the bumps.
First off you want to Drill the rear 3 hole pistons to 1.3mm or even 1.4mm if its a really bumpy track. Also drill the front 2 hole pistons to 1.3mm. I ran this set up yesterday at Batley Buggy Club with 30w in the rear and 40w in the front, the car was excellent through the rough sections of the track.
Another thing me and Adam played around with yesterday was anti-squat. We went from running 3 degree to 2 degree and this made a big difference! Instantly you could put the hammer down through the rough sections of the track without the rear end bouncing. Fastest lap times were almost half a second quicker then the previous round using 3 degree.
Also adding the brass weights to the rear will keep the car even more settled and putting your rear camber links on the very bottom hole on the shock tower. Doing this will make the car recover better if it starts getting out of shape.
Hope this helps!
Craig Collinson