With a 503 MCAT, the only MD schools worth applying to are all the NJ ones. You should have more DO schools on your list. I suggest:
Rowan
NYIT
PCOM
LECOM
VCOM
UNECOM
Touro NY (but I believe they prefer higher MCAT scorers)
KCU
KCOM
Campbell
DMU
Touro NV
ACOM
WCU
Marian