I actually attend the St. Pete campus. If you are looking for the research opportunities then you have to go to the Gainesville campus. However, you do not have to go to the main campus until your third year since the PhD program doesn't start until you are a 3PD. You should not be worried about where you got your grades from, because the majority of my classmates are USF and Community College Alums. Just make sure you have a competitive GPA, PCAT score (which you have) and are a Florida resident (which you are) to have a high chance. At the St. Pete campus it has its positives and negatives. IMO, since I have lived in Gainesville during my undergrad years, in comparison I have more time to study and relax since something is always going on in Gville. Yet, if you are into football and have tickets then you have to drive up every single weekend.
For social life, you have a mixture of people. I myself like to go out and at the same time get my work done. There are bookworms, party animals and everything in between. Also, the distant campuses have their own organizations if you want to get involved in the community. I have hung out with the Gainesville campus and they have an equally proportional turnout as the St. Pete campus in terms of social nightlife or on campus events.