Thank you! I'll get right on that ^-^Literally the only times I've ever gotten 4 off, is during Council. And really the only reason I was able to manage it was because I was queuing up to apply Doom RIGHT as UVLS procced. That, plus the fact that all the elders were stacked at that moment, allowed me to get 4 100% crit Dooms out - check WoL 10 man normal to see the result ;-)
Actually it's not incredibly hard to get 4 out when you are standing there testing on target dummies, but because it's such a tight window I rarely try to get 4 off in a raid situation. To me it's not worth possibly overwriting an already 100% crit Doom just to be able to push 4 out in that small window
---------- Post added 2013-06-24 at 02:04 PM ----------
I would say yes - switch the haste gems and hybrid haste gems to mastery and hybrid mastery accordingly. Get at least 8100 haste and pour the rest into mastery. I was recently able to get over 15k haste, and so I'm currently in a high haste build. Doing this purely for the increased imps - I can usually get an Imp Swarm off again before Dark Soul comes back off CD. That said, I've not noticed any real significant difference in my DPS from when I was gemming mastery and just going for the 8100 haste point. I may switch the gems back once I'm not so broke @_@ but I'm liking the high haste build for now.