The only problem here is California. You should by all means be trying to get into a UC, and you should by all means get into one, but it might take a while because you're up against a whole lot of overachievers like yourself.
You've already done everything right. Imho focus on doing stuff because you like it. That can make a huge difference. Try to do something that honestly interests you. Why? It makes you more interesting to review/interview if you're interested in what you're doing.
Sure a few more points on the MCAT would help, just be sure your score doesn't go down. Be paranoid about your score going down.