re: Poker & Playing Too Tight
Just start fcuking with people.
Seriously though, I'd say just open your starting hand requirements on the button/cut-off as a good first step. Start playing some hands you figured are trash, and see how you do. My VPIP on the button is like 50%, and its my most profitable position by far. If your % to steal isn't ~1.5-2.0x your PFR then you're probably playing too tight.
Think of it this way: If ATo is -1 bb/100 in EV from early position, but the button adds +2bb/100 of EV to your hands, then ATo is certainly playable from the button. So while yeah, you're probably profitable playing your nitty game, you could be *more* profitable loosening up a hair. Plus, it'll help when you move up.