Tighten up. Way up. Especially early. My SB stat is like 15/10

Secondly, I don't think the big pots are the problem. Yea you ran bad on a few. I found when I started analyzing and watching what I did in the 40BB and under pots my game improved. You know the ones. Limper, you raise, caller and limper calls. Flop, limper checks, you c-bet, caller calls, one fold. Turn, limper makes big raise, you fold.

Hundreds of these hands, costing me 10BB, 15BB were causing the bleeding. Check PT after every session. Do you have an equal number of big hands in green and red? Look to the middle more often.