Biggest thing is how passive you are, 8.91 PFR is just way too low. What hands are you typically raising UTG? Personally, Id say the biggest hting to raising that number is to stop open limping in any position. In looking over my stats, I actually play fewer hands than you do UTG but I seemed to have settled down recently at around 21/18 overall. Not only should you just be raising more instead of limping, but you should also be more positionally aware. Id suggest trying to get your Att. to steal blinds up to around 30%, you are giving away money by not stealing more blinds.

Can your game beat 25nl? Yes, for a very good amount, but you could beat it for more with a more aggressive game and not only that, but as you move up you will _need_ that aggression to win. To sort of recap, dont open limp [limping behind a couple of players with marginal hands in LP is ok, but limping UTG is not] and steal more blinds.