So, I have lost a little weight and need a new bra. I measure 34 underbust and 40.5 overbust. Problem is, I'm currently wearing 34 backs and I can pull them at least four or five inches away from my back. I tried a 32 back on, well, I tried to, but I couldn't even get it close to fastening! What size should I be and what brands would be a good bet to try? TIA 