Not bragging or anything (hopefully). I just did a quick session at 10NL 6-max as a trial run for my backer before I moved up to 25NL for him. Here were my stats:
From what I can tell, you are playing much tighter than myself preflop (My pfr> your vpip), 3-betting fairly wide and you were super aggressive.
My biggest guess, from what I can tell, is that you are making most of your mistakes postflop, especially considering how tight you are preflop. It's hard to say without actually seeing you play. Having a reasonably loose preflop game (it is 6-max and its against donks usually), well timed aggression, stronger postflop and running better I think are the things you are missing most