I'm not sure if I've ever hunted in one of the blinds you've mentioned, but I've hunted in a number of blinds that were made specifically for trad bow clearance. Even with my 60" recurve, I've had to scrunch down into a half crouch and cant my bow to take a shot. Usually there is a seat, but I don't think I was able to use it without canting, and the shots you can take from the seat are limited.. I just don't think there is enough extra clearance between a 64 and a 66" bow to make much difference. Better to learn to scrunch and cant. I usually spend the first 10-15 minutes in a blind experimenting with what posture I need to get in to take a shot in various directions.