Good tune, ready for the next level.. I could imagine this being worked up using real musicians. (bass, drums, keys, keeping the strings & midi various parts.)
You might consider trying it sometime, you might be surprised how it could turn out.
Softube Tape & IK Tape Machine Collection are both excellent, Taupe is yet another flavour plus the strip model incorporates a comp & eq.
All are useful, personally I like IK TMC the best for 2 bus or mastering , in fact it's the only IK product I've kept installed on my system.
YMMV
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Taupe suite consists of 4 different plugins:
TAUPE Channel-strip (massive dreamware 6U rack unit channel-strip)
TAUPE TAPE (3U tape rack unit)
TAUPE EQ (3U rack juicy EQ section)
TAUPE COMP (Single rack unit compressor/limiter)
http://www.acustica-audio.com/store/products/taupe
I would just think in terms of breathing, phrasing & dynamics. Try sliding notes of different instruments or tracks, or lines a few ticks +/-. Same with velocities or using expression wheel. Weave lines together until they blend naturally. This can help stop that synthy sound when notes are played together all at once, at the same time & at the same velocities.
I've stopped using Neutron & their other plugins so the only upgrade I'm interested in is O9A which is $149. With so little new or improved features I don't find it's worth it.
Their pricing scheme has always been convoluted. I've caught mistakes in their loyalty upgrade pricing before. They did fix them which was great just check to make sure yours are correct.