I ended up going from 36c to 34e so the same as you down band and up cup. A few years ago I had a fitting at m&s I was 34c then and the band was rubbing as you said they increased my band size instead of cup. Seemed to be fine until recently though. I ended up spending £118 which I didn't need to do but I thought whilst I'm here I'll get a few that definitely fit and should last me a while. One of my old ones still feels fine so I think I'll wear that for work until it breaks or stops being comfortable