That's pretty high. I can see doing it if you're scouting but hunting from that altitude would give me a nose bleed. I use an Old Man climber and can adjust those straps while up in the tree. It's a scary thing to do and requires a bit of guts and coordination because to get back down you're going to have to loosen them up again. I usually don't get down until it's too darn dark to see a thing so I'm doing it all by touch. I can think of only one place on my property I get that high and it's only because the tree sits in a valley so the only way to get 20 feet over the surrounding high ground is to get 40 feet up in the tree. I won't even think of using it on a windy day. You can get tossed around quite a bit up there.
I agree with supaarcher that the best move is to start the climb with the stand as tight as possible.