After several different experiments I think that I am much closer to figuring out the sticky masking issue (bad humor). I actually picked up a second liquid mask, the Micro Mask type, which seems to have some advantages and disadvantages over Ambroid. Micro Mask is somewhat thinner and easier to see through, and seems to come off MUCH easier with water or with Windex.
Speaking of Windex, I have found that this seems to be a good solution for cleaning up liquid masks, but I have also begun applying future between paint coats to seal the paint.
At this point I would have to give the Ambroid Liquid Mask high marks for masking canopies, with the only down side being that it is much thicker & more bluish when dry, so be careful when cutting the frames out.
For the masking of larger areas I am liking the Micro Mask product, which seems to clean up a bit easier with warm water or a little bit of Windex cleaner.
If anyone has any other ideas to share, I welcome any and all suggetions. The above mentioned ones are all good from my experiences and tries at them.