Funky piece. Based totally on my musical styles, I would like to hear that womp bass a bit more, its the answer part in the first Bass Riff, after the growly bits. I think you could pull those back just a little as well, but again, I like a slightly less heavy sound, so just my take on it I guess. The 8 bars right before the break sounding hoppin to me, with a couple of those tamed growls added in to that riff, would sound a treat!
Agree with laslien about the intro, maybe you could fashion some nice stabs out of your bass line to pepper about here and there, some of the growls, some of the womps bass sounds, would add a bit more beef.
One thing I really liked were the different transitions you come up with moving from 16 to 16.
Its a hard tune mate, and well put together, nice work!