nice build up...not really my sort of dnb but i think ur bass synths are a lil too loud in the mix. plus its a lil repetitive.
but i reckon if u turn the levels down on em a lil, ur drums n everything else will have a lil more room.
There is plently of sub bass mate, i played it out on saturday and there was deffo sub bass lol, but yeh i think the drums need bringing out a bit, the mixdown in general needs work