I would email again, faculty often get over 200 emails a day (trust me, I have seen first hand), so its likely that it may have slipped past. If you email again, and still do not receive a response, maybe try another person.
Hello,
I am in the process of finishing my PHS (although i am applying to UC (I,R, SB,LA) PhD programs in Psychology).I would be interested in exchanging PHS (w/feedback).
Thanks