[johnc]

Definately find more spots to rasie preflop. I see your low number here hurting you in two ways: you're easier to read because even the weaker players know you have a big hand when you do raise (losing you value), you have much less fold equity esp on the flop when you limp. Try to find more spots to raise and you'll find your c-bets taking down a few more pots here and there.
Also, I think your somewhat high post-flop aggression tied to your low PFR% & VPIP% possibly indicates you giving your opponents too high implied odds and you're maybe facing too many opponents with your bigger hands that only hit TP or overpairs. Check your hands to see if you are over committing (1/3 of your stack) too often with TP/overpair hands.
I suggest trying to increase your PFR% slowly over the next 10-20K hands by stealing more blinds and raising more of your limping hands esp in late position.