You don't need a PB because your GPAs are competitive. Focus on increasing your ECs. You need to either increase your Rehab hours as well as perhaps get 150+ hours in another clinical setting. Also, you will need non-clinical experiences at places that serve those less fortunate than you to show your altruism, and also shadow a PCP (50 hours should do). Lastly, get a competitive MCAT (512+) will get you interviews at UTSW and the other TMDSAS schools.