I guess if you're trying to shoot gobblers at 75 yards, then yeah, don't go less xxx full. But, I have to ask, do they even make anything more than xxx full?
I shot two more birds this year with a modified choke (12 yards and 34 yards), and one with an extra full Indian Creek tube (12 yards). The two shot with modifieds were just as dead as the extra full.
I've got to disagree with you on the missing situation. I've never missed with a modified or a full, and have missed quite a few with an extra full. Most of the misses from people hunting with me have been with extra full tubes. Slinging a baseball sized pattern at 15 yards is a recipe for a miss. Slinging shots at 75 yards with any tube is a recipe to wound a bird.
Enjoy the show, let him strut to inside 40 yards, or better yet, inside 25, its so much more fun. Shoot him with a full choke, he's dead. If he hangs up at 75, let him go.