It’s hard for subject tests to hurt you at all unless you’re ~sub 670. At UGA, a friend from my school was one of only 5 Foundation Fellows Scholars (full ride + privileges and $$$$$) and he got only a 690 Physics (but 780 and 800 Math I and II).
Unless you expect getting considerably lower than 700 on 2 or 3 of your subject tests, they probably won’t hurt you. Just go for it!