Well, I'd love to get high and always did when it was possible. Now in OK 15' is is dream tree. Sometimes I can find one I can get up 12' somewhere, but very often I'm under 10'.
I have yet to have one spot me in 2 years. If you know how to move, put some leaf's, just a little twig or two, on your stand helps, and spot the deer first but I've had some sneak up on me and they didn't see me either. I am NOT anywhere near the canopy, but the canopy is lower than regular big-woods forests, and there are more lower branches. There are just so many branchy limbs you can never get up there, and trees fork about 15-20' high, and most get too small to be safe any higher up.
Killed one off the ground too at 20 yards this year, 140" 10 point. I wear a 3-d leafy top only with the hat when on the ground and haven't been spotted from the ground yet either, with a doe and 3 little ones within 10 yards one time. Another deer I got this year I was about 6' up to my platform, 140" 8 pt. I've seen lots of deer from that tree this year within 20 yards and none spotted me, even if they smelled me and were looking for me. One time I dropped my rattle bag and a smaller 8 pointer got kinda spooky but never saw me still at 20 yards, and bedded down about 60 yards out. Come to think of it, I can't ever remember being spotted in 2 years here. I do wear a 3-d leafy hat, and try to always have a few leaves hanging off the stand, and that's about it. Seems like I can move around a lot, they won't run off till I actually start climbing down. When I go back to hunt MO, I get at least 15' high, rarely over 20'.