Help me please- <any chance to get even an interview invitation?>

Hello. I have applied to this cycle and haven't received a single interview invitation.

Here are my stats.

Accum. gpa 3.21
Science gpa 3.02
DAT AA 21 (92.8%) TS 21 PAT 19
I got the recommendation from biology, physics, English professors and a dentist.
I have done some volunteer works, job shadowing and currently working at the dental office.

I am thinking that my gpa is the problem that I didn't received a single interview invitation for this cycle, because I got below C in some courses.
Should I take some more science course at the community college?
or take the upper division course through extension program?
Does anybody know good extension program to take upper division biology/biochem courses in california?
Or should I just re-take the DAT?

I summited my application in Mid-July and took the DAT in Mid-September.
I am kind of thinking that maybe it was already too late to take the DAT at that time (compared to other ppl/ process time)

I will submit the application as early as possible for the 2008 cycle, and trying to take some more course in summer & fall.

Any suggestions? Thank you so much-

Also, can anybody suggest me schools I might get a chance to get some interview invitations?

Thank you so much for reading this post, and for your replies.