I hate to say.. I see very little conversion to MMA style training... 5 minutes on a heavy bag is like a light warm up.. not a work out.. I think your still too focused on the heavy lifting.
That's funny you say that because I was thinking the same thing...I'm going too check out an mma school in Airdrie on my days off coming up(a buddy of mine lives there and is interested in going too) and maybe try out a few classes, see how I hold up during the warm ups. I was also going too pick the brains of a few of the instructors there. Anything you would recomend?