I'd go with Alumrock's suggestions.
Probably take care of the problem.

From there, to answer your question about better wheels,
A good set of wheels for the type of riding you are describing with drops, jumps, and rock gardens for a good price is definately the Halo Combat wheelset.
Strong enough for what you are doing and at a decent price too. $250 for F and R together, a little more buying seperately.