In my opinion, CXP33s aren't much stronger than Open Pros. I had 2 pairs of CXP33s, and cracked both rears. I kept the fronts and replaced the rears with DT RR1.2s.

I you wanna keep riding like you do, I recommend sticking to 30mm deep rims, at least on the rear. The DTs look heaps cooler than the Velocities