Another mast could make a difference. However before you replace an expensive mast, just have a closer look at the cambers itself. As keef already mentioned; cambers are not meant to have a tight fit. You simply take them out of your sail and put them on the mast where they supposed to be when the sail is rigged. Does this feel tight?

I would just replace the second and/or the third camber from below, with a camber from another sail. You might be surprised with the difference this can make.