This kind of play (and running 20BI below EV) is the reason why I've gone back down to 25nl. I've always struggled cutting out the issues you're currently experiencing, but after going up 20BI and down 20BI pretty much constantly, I've come to one conclusion as to why: volume tilt. When I play a bunch every day, I knock off buy ins like there's no tomorrow with pure spew, but when I take regular time off, I rarely have a losing session (EDIT: this pretty much echos my post on 22.01.14).

50nl is a funny stake. At 25nl, the rake is still heavy in terms of bb/100, but there's enough players getting stacked that it doesn't matter. Get to 50nl and players aren't giving it away, but the bb/100 rake is still pretty much equal to 25nl (which means you need to be doing well to beat it). That said, there are still a lot of players giving it away in a different, more needlessly aggressive fashion at 50nl i.e. like in some of the hands above. When you think about it simply, the games should therefore be pretty easy to beat.

FWIW:
1) A6s - terrible board to bluff raise at this stake given you have air nearly always. Great board to raise if you do have it based on what I typed above.
2) T8s - I like the stab and your sizing. Take a free one on the turn though.
3) AJs - looks okay.
4) A9o - I prefer a call pre. C/f flop is fine though imo - just because we 3bet on the basis of getting enough folds pre, it doesn't mean we have to cbet a flop that nobody is folding.
5) AJo - never cbetting this flop ip vs a BB calling range without better equity (which is probably bad on my part).
6) J8o - calling turn and sizing river strong to manipulate a fold vs a chk.
7) 89o - feels a bit loose pre. Turn lead is fine, river is marginal but don't hate it.