What kind of physics do you want to do? Optics/Biophotonics? If so, do you have publications?
You're in a similar situation to me, except I had slightly higher PGRE (770/68%) and excellent research (your research may also be excellent, hard to say from one sentence). It's an odd paradigm; excellent research with less great grades, and hard to know how schools will react. Best advice is to send out lots of applications.
From the sound of it, you have a good shot at Boston U, which has a very impressive photonics program, and a good overall reputation. It's hard to predict how you'll fare in the more competitive schools (rankings above 25, like Columbia), my suggestion is to apply to 2-3 schools along the lines of boston, then apply to as many schools as you can that are ranked above 25...and maybe a safety school just for good measure.
Best of luck!