oooh, jazz and dnb. haven't heard that combination in a while
can't say much about the piano and synths, since they're perfect as they are
as for the bass, maybe you could use one with a bit more movement (modulation? idr the exact term) as opposed as just a sub bass, for texture [EDIT: for example, a hoover bass]
for the drums, instead of just fills or removing the hi hats/cymbals for transitions, you could strip it down to the snares and/or hats. the choice of samples is great, though.