[revxml]

You've gotten some great responses to your dilema.
However, I've been using ProMark forever (seems like) and I had a similar problem, occasionally, when I was using 5Bs.
Years ago, when they first introduced the 808 Billy Cobham series, I checked them out and instantly switched. since then the problem hasn't recurred.
There are a couple of reasons I like them over the 5Bs:
1) approximately the same weight and diamter as 5Bs
2) less taper so that the diameter is larger, closer to the tip (helps on cymbal-induced stick breakage)
3) the tips are circular, instead of tear-drop or oval, which (too me) gives a better response

Just thought I'd chime in.

kb