I tend to disagree with everyone else. As long as you have good ECs, I'd apply now rather than after the August MCAT. You have a good score, maybe not Harvard good, but good. The August MCAT score won't be in until October, putting you at the very end of the app cycle. People will be getting accepted before you even receive secondaries. Having applied to the UCs, let me tell you it's a long process, and even if you have a good app, sending secondaries in October will probably just get you put on a really long hold list. They have so many good applicants, they don't even consider us at the end.