Congrats on your improvements!
Ask your Greek friends if their chapters are doing informal/COB. If they really like you, they may be your best resources in your quest for a bid. Be chill about it, though. You don't want them to feel like you're using them or pressuring them to go out on a limb for you, especially if you don't really know them very well. Also remember that one or two friends can't make membership decisions for a whole chapter.
As others have advised, don't feel too badly if things don't work out. You have less than a year left of your undergraduate career and your overall GPA is still barely qualifying. Even if chapters like you a lot, the decision may remain out of their hands.
__________________
@>----'---,---- Alpha Omicron Pi -----Phi Beta Kappa ------
|