To be honest, I really don't know why you havn't heard from the UC schools. Maybe its a clerical error of sorts. I consider myself one of the luckiest applicants on earth because my stats were not all that spectacular and I got interviews at USC and UCSF.
The AdComs are a weird bunch. It's almost like they flip a frign coin or something. My stats have always been lower then any of my peers at all my interviews. At UCSF, everyone there had already been accepted into several good schools (UPenn, UCLA, UW, UoP, UConn, Columibia, etc) where I was totally embarrased that I havn't been accepted anywhere and only interviewed in AZ at that point (If ya didn't know, everyone and their mother interviewed at AZ).
Having said that, the reason I did get an interview and eventual acceptance is from the other parts of my app. I'm 35 and have done a lot in my life. Served in the military, was in a war, owned my own business for 5 years, went to a good undergrad school, etc. I know UCSF likes maturity and you can't get any more mature then an old geezer like me!
Good luck!