Get another pass through FA for sure...I wouldn't bother with Pathoma anymore unless you feel like its helpful.. I found that it made things make sense but it was too basic a level of understanding. I would aim to finish UWorld at the least and if you have time get comquest or combank and do some comlex specific questions. 500 isn't bad but at that level you have room for improvement in most areas so I wouldn't worry so much about your diagnostic techniques and health prevention as just focusing on knowing as much about everything as possible.
How is your OMM prep? Knowing chapter 10 in savarese (spinal levels) and memorizing the main chapmans points will bag you a good deal of the OMM questions...plus I actually found that spinal levels/innervation and anatomy were helpful for step 1.