Hey man!
Don't see many people following but I shall!;) I am currently playing 10NL on Stars. My biggest leaks are my mental game and mindset along with the lack of a plan postflop. I started working on both not long ago and already seeing results. My BR is at $807 at the moment and I am planning on taking a shot at 16NL as soon as I put in more volume. I feel that at the moment this is my biggest sticking point.(lack of volume)
I am re-studying W34z3l's walkthrough also along with Gordon's Double Your 6max Winrate. Both have been of great help!
One thing that bothers me a lot is my red line which is going down no matter what I try. For a while it ran break even and I can't figure out how I did it. I will keep working on that.
If you would like to discuss strategy, mental game or anything else Poker send me a pm and we'll get in touch on Skype.;)
Good luck at the tables!