On 1620... Do you use side chained compression? If you sidechained the kick to that bass you can get some rhythmic pumping going on, it will break up the constant bassline and make it more rhythmically pleasing.
That bass synth I think you could cut off some of the high end, the sound gets a bit annoying after a bit, I think the drums could really use a bit of variation too.
I dont think the sound selection really suits dnb IMO.
1565. Drums are much more Jungle style here, but the mixing is off on the drums and the drums are still a bit repetitive. The bass and those synths are drowning out the drums a bit, the drums and bass should be right up front and center and the synths should be much further back in the mix. Lots of cymbal in the drums, makes its sound a little washed out.
1543. That electric piano is far too loud, its drowning out everything else. Drums need to be louder. I think just taking that electric piano down will solve a lot of the issues with the balance of this. Love the shaker that comes in momentarily, personally Id use that electric piano for the intro, then take it out, it gets a bit annoying after a while.
1542. Now this sounds much more authentic jungle, sounds like you sampled an old jungle track. Once again that pad synth is a bit too loud in the mix, its drowning out everything else and affecting the whole balance of the mix. Snare is at the right place on this one, kick could probably be much more punchy.
1541. The chops that you added are a bit loud and they jump out too much.
What is your monitoring setup?
I think you should work on your drum programming game, adding fills and variations that keep it interesting as the beat goes on instead of just having a drum loop that repeats all the way through the tracks. Also I think you should work on the mix balance of the tracks, kick front and center, snare front and center, bassline sitting under the kick and then everything else under that, except vocals, they will be front and center with maybe some panned delays, some reverb and other fx on them.
Heres my most popular DnB track, let me know what you think?
I have fixed the bass on this so its not so overbearing but I havent uploaded that version to soundcloud.