Hi Ace! I usually get the same problem, on these particular mud guards I sectioned the masking tape prototype up in smaller sections (wich unfortunately is quite visible if you look close). Other than that I guess it's left to the old Micro Sol/hairdryer trick. Wet it up and go over the piece with the hairdryer. This also takes care of the problem with too large pieces of CF decal as the over flow "melts" away from the fluid and heat. If you are left with bubbles, pick them with a needle, then go over it again with fluid and the hair dryer. That would do the trick although the Ducati mud guards are VERY complex. You are probably better off when doing it on your new yamma build.
/Joel