I like your team as a whole. You have some good young talent in Posey, Panda, Stanton, Revere, Pineda, Norris, and Jansen. You have a lot of other guys too that can help you this year as well. The bottom end of your rotation isn't too strong, but given your top, you should be OK.
As far as AVG goes, I think it may be too much of an issue to fix. You would probably have to trade away 2 of the guys that hort mentioned (and add in some .290+ hitters) in order to balance things out. If you are in a Roto league, I would advise doing so- probably by moving Howard and Uggla. Definitely not Stanton in a dynasty league. If you are in a H2H league- let if fly. AVG varies A LOT week to week, so you may end up winning AVG a handful of times.