I seem to be raising around 10% of hands at 1/2 (don't have a significant sample size), and I'm winning by far the most from the button (incidentally, my PFR is 4% higher here than any other position, but that should settle down a bit after more hands). Once you're comfortable with post-flop play, raising various suited connectors, offsuit broadways, and so on against tight blinds seems to make quite a difference.

Try playing some 6-max or other shorthanded game, you'll learn a lot.