The subject test is pretty important for foreign students, but not so much for American students. You have done very well, so as long as the rest of your application is solid you should get in to the programs you want. Note to American students who might be intimidated like this: no American ever scores this high, and the admissions people know that. Foreigners take 2 to 3 times the physics we take in undergrad, and so committees judge on different scales. Coming from an American institution, you can be competitive at the absolute top programs with 70-80 percentile, or if you are in experiment rather than theory even 50-60. In the US, it is grades and especially rec's and research experience that count. Just make sure you don't do terribly on the GRE and focus on getting the rest of your app to be strong. Sometimes, even just one good rec from a research adviser can get you in to a program that by the numbers you have no business being in! (yeah, this is mostly to any American students who might worry about these crazy foreigners ;p) They score higher as a rule, but come out of graduate school about the same quality of scientist.