fairly new to BMF myself, but it gives amazing results. I have yet to have it peel up paint yet, so, I want to ask, what kind of paint do you use [enamel/lacquer/ or ??] and how long are you letting it dry?
when you cut the BMF, how are you doing it? I find a new blade is a must [i use an exacto knife], and I find the weight of the knife itself is plenty heavy enough to cut the foil, no pressure exerted by my fingers, just drag the knife along and let it cut. I wonder if maybe you have a combo of still not cured paint, and a little heavy handed on the foil cutting?