fencelake
70cc twin V2
I think you solved your own mystery. If you trimmed the graphics after you applied them, I'd say you scored the ultracote at the very least. Maybe even cut through it in some places. Which made it really susceptible to lifting and tearing.
You may have a point, because I had to trim it exactly at the leading edge where it met the black. hmm... Well, the next one I'll have to cut it first and then apply. Good call!