Sweet formula

Li
Iso a sweeter formula. We've tried enfamil prosobee, gentlelease, and enspire, all of which she gags from. We're waiting for the similac sample to come in the mail. I am just wondering if any of you mamas have any suggestions. She's been strictly breastfed since day one (she's 5m old). I need to put her on formula because I am going back to work next month and when I pump, I hardly get anything. I also have that enzyme that turns my milk rancid and sour. I plan to continue breastfeeding when I'm with her and on my lunches. Any suggestions?