Your rotation is the weakest part; you have a championship quality team except that you're trying to win with 3 SP3s and 2 SP5s. Remember, in STL in the NL a 3.80 ERA is just average; you need some guys in the 3.00 range to have a solid pitching staff. If you have frontline prospects and some budget room this is the season to grab a high-priced SP1 at the deadline.
Also, you fell in love with not-Rickey-Henderson-clone
Stefen Palacios, who can run but whose career OBP of .323 is no fluke, and who has power at all in LF. But you'll score (park-adjusted) runs, and
Cantu is a special player in CF.