Tight drum loops. Probs a tad over compressed. That bass kick hits so hard it sounds like it clips stuff, might also be the hi-hats working at the same time. You got that loudness thing down pat though :)
You side chaining that sub bass at all? Letting the bass drum counter the levels of the sub would let you fatten both sounds up, juicy. Toss in some liberal panning on the hi hats to give off the illusion they're louder than they really are then lower their levels to make some room. You could also fit a shaker or tamb and pan it into the channel opposite the hi hats. It sounds like there is some white noise when the drum kit plays... not sure what that is, might be a shaker :)
Damn, I love how experimental it gets. I usually don't recommend people put silence into tracks but I liked that fuzzy silence at 4:40. You could have slipped a sample into that spot there but, meh. This track reminds me of old Violence Recordings with Hive, Gridlok, and Keaton. Keep bumping the breaks :D
edit: six minutes long? Calm down there LazerBrain, you're flexing on the rest of us with our 2 and a half minute romps.