I have a B4.1 I try and race every Saturday I usually do really good.. This last time I went I figured out the best way to get around the track being somewhat fast. I have been just recently having problems with my car.

I have the camber set at -.01-.02 then I'm running shrubs and AKA rebars in the back.. They hook up really good.. But I've been breaking ball cups for some reason.. I have no idea why.. I now have RPM to replace the ones that break but if those break 2 what could be causing it? (back right closest ball cup towards the wheel and tire)

I'm not looking to get a better set-up to make it faster, I have been reading around on this thread but I dont know what I should upgrade first.. I know I have the tires and motor covered.

So here is a list of what I have done:
RTR B4.1
13.5 Sensored Brushless (Novak)
Novak Havoc 4s capable
Aluminum Hinge Pin
Shrubs
AKA Bar Codes

What else can i do to make it better?