For the past 4 years I hunt at 15 feet. For my entire life before that I hunted 22+ feet, sometimes up to 29 feet.
I've killed SO many more deer the past 4 years at 15 feet that I won't go back to 22+ feet. One reason that I think I've been more successful is that I've become an absolute scent control fanatic, and I use great camo. But I also don't think that the extra height did me any good.
I know that the experts say your scent cone stays above the ground the higher you hunt (and I'm sure that's true), but if you are careful you can hunt closer to the ground and not alarm the deer anymore than if you are higher. It just takes paying attention to the details.