Fur: I use Recount on all of them as you say to keep things synced, and yeah the numbers matched.
Kar: I have a seperate button to cast Flame Shock at the beginning of the fight (actually a macro that has a modifier for Earth Shock or without a mod to cast Flame Shock). I lead with that then spam 1 to nuke and do my normal tank rotation.

It should be noted however, that overall DPS was about 1800 for the entire instance VS these spread numbers on one boss. Everyone, even the DK did approx 20% of the total damage dealt (give or take 0.2%) at the end of the run.