hey, i have being playing NL10 on pokerstars, and after 8k hands i am beating it at 6.3BB/100

however, i am not being sucessful in my tries at NL25, even though people say the level is not much better.
I have decent hand selection, with a V$PIP of 20% and know about position.
I hardly slowplay, and my line is usually pot the flop, 1/2 or 2/3 the turn and then bet again on some rivers.
However, i find it really dificult to have a range of other ppl hands, since they play any 2 rags.
So, how can i improve my post flop play?

Right now, after 2,3k hands ( i know it is a small sample), i am down 3.6BB/100 at NL25.

Any help is really apreciated, and sorry for my poor english.

Thanks in advance

Edit: I play full ring