I know this may be construed as "sunshine blowing," but I think you should try this ONE LAST TIME. Don't make a nuisance of yourself, but if I read your initial post correctly, you only went through formal recruitment once and tried COB with just one group. You haven't become the girl who won't go away yet! The fact that your GPA has improved, your overall attitude toward Greek Life has improved, and you have met more members of the chapters can do nothing but help you, I would think. (That was awkward wording, I know, but my brain is fried from work right now!)
Also, something to consider--other people in your situation. How are sophomores going through recruitment (which I assume you are, but am not sure) looked upon at your school? Do you know of any who have received bids? Do you know of any sorority members who went through recruitment twice and received bids? The reason I'm asking is, at my school, neither thing is considered a big deal, and I go to a small Southern school as well. And, I've said this before, but RECS, RECS, RECS!
Good luck with whatever you decide.