The tape is a good bit small than most, I love it and take every other call i get and trim them down to the same size as my hooks but some guys like more tape.
what do you mean by over stretched like the call sound is alot different? too high? too raspy? are you sure the reeds aren't just sticking together
rinse them off in some water and non alcohol mouthwash, pat dry with a paper towl and give them a try again.