I also use a wb poly and have wrote about both issues before and why I use it lol. And headaches associated with it at times
Fletch tape is a lacquer based tape and does NOT stay stuck to everything. If it's failing you now save you're self the grief and re fletch with glue! They will keep falling off! One cold snap and you'll be left with naked toothpicks. Don't ask how I know lol!!!
Profin burns in 3d targets and compressed fiberboard targets. Not as bad as some finishes. It will also change your colors if u try and over dip with it more than a coat or two! Otherwise it is a great finish.
The simple solution to the compatability issue is don't overcoat!
Since your cresting is a simple design , you may find it better and less hassle to crest the wb clear on instead of dipping. Once your bands get wider you may find it easier to dip than crest. Personal pref here.
Arrows look great btw!