only playing PP (all of them since sets pretty much always pay off at this level for alot, "set-hunting") , AK and TJs.
[I can't believe I'm telling someone this], but are these honestly the only hands you are playing? You really need to open your game up. Like if it folds to you in late position and you have , you aren't making the ridiculously easy opening raise?

FWIW, those hands account for a whopping 7.4% of total hands. I can't imagine anyone with half a brain ever giving you action for a big pot unelss they had the nuts or close to it.

Don't take this as a contradictory statement to what I said above (because in order to beat any sort of a competant game, you will need to loosen up), but with short stacks at the table, you do need to tighten up a bit, especially if they are on your left.

In truth, I find it surprising that you could beat the NL100 and NL200 games but are struggling at NL25. I suppose it could just take a little bit of adjusting? For example, the NL100 game on stars often plays really weak/tight, and I think some of the regulars in that game (it's been a little while since I played in it) would have a tough time in a looser game where people wouldn't fold to your c-bets 4 out of 5 times.