Personally haven't run into problems at 25NL yet - in a very small number of hands I'm doing ok. Probably on a burner...

FWIW on Party I find that a 4bb ($1) preflop open-raise gets a reasonable amount of respect with a TAGG image.

Anyways, there are some important questions to ask, SonOfAkira:

1. You say you're a pretty proficient mid to higher stakes player. Are you really? I mean no insult and don't doubt that you are, but are you being true to yourself? If you are a winning player, don't bother with lower stakes games unless you want to beat up on fish... or go on tilt.

2. Bankroll. Are you properly bankrolled to play at the upper stakes? The more proficient players on this site have continually stated that you can NEVER be playing with scared money. You should NEVER be stressed by the money.
Scared money is dead money.

Being "stressed by the money" will affect your play and your decision making.

If you go on tilt, just walk away from the computer. Tilt just leads to bad decisions, more lost money, and even more tilt.