Someone here made a very valid point about recount, over the course of a regular heroic boss with dps spikes and how fast a fully geared group can kill the boss really throws off any damage meter like recount.
As for the training dummies, I have seen people posting here saying that they did their check on non-heroic dummies to simulate what their dps would be in a raid due to missing all the raid buffs.
I think the fact that you kill stuff very fast is the real dps meter