A couple of thousand hands is really to small a sample to draw any conclusions, keep going at it and maybe post some hand you are unsure about.
What do your postion stats say? are you perhaps playing too tight up the back as you move up?
Also have a look at the tables you've hand good results on and the tables you've had bad results on. Look at the dynamics of the table where you have done well and where you have done badly. Compare them and use this for game selection. Game selection will get more important as you move up.
What site are you playing on?
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