Former WHM gone MCH speaking, so I'm still trying to figure out how to DPS properly. But for times when the bonuses just don't appear, that's when I normally pop my cross-classed cooldowns (Hawk's Eye or Raging Strikes) so that my DPS doesn't fall into the void, never to be seen again. The only situations I've encountered where this isn't as feasible is when a sudden DPS burst is required, and I end up expending all of my remaining cooldowns to meet the check. That being said, I normally save ammunition for when worse comes to worst and I have no other cooldowns and am getting no procs.