Tried just about all the glues out there. Goat Tuff is good, but it tends to not like variables in weather. Saunders NPV has been the most consistant performer. Maxima shafts are a little tricky to get good bonding. Best bet is a high quality laquer thinner first (Absolutely not paint thinner or acetone as they leave too much residue). Or my favorite is to apply something like a carbon Blazer 4" wrap.
Flex Fletch vanes are a great vane, but you have to really wipe the base down well before fletching. And, they really don't much care for the instant adhesives. Use the same high quality laquer thinner as you would for the shafts. Place the vane in your Bitz clamp and rub until you see some color witness on the thinner soaked white towel. Buggers will never come off then!
If you are using Goat Tuff or other Cyanoacrylate glue you must rinse off the thinner really good and let it dry for a good long time. Simple Green might be a better cleaner if using these type of glues, but again rinse, rinse & rinse again.
The only vane I never worry about cleaning has been AAE. They have a Blazer copy that is outstanding as is the Max Hunter. I've switched exclusively to AAE as have most of the competitive shooters I know.