I use a Summit and experienced the same problem years ago. Here's what i did and other posters have hinted the same. I size-up the tree, set my stand a little tight at the bottom knowing it will level-out when I get to my desired height. This takes some practicing, but it works. Funny thing is, I have memorized some of my favorite trees where I often hunt from and can tell you exactly how tight I have to secure my straps/guides before even getting to the tree.

I have, however, hunted osme trees that are almost exactly perfect from bottom to 30 some feet. I mean, same thickness and straight almost half way up the tree. Only downside is that these trees are mor eor less out in the open within the woods and not ideal for bow. I use them for shotgunning. It's the trees I use for bow hunting that require some special maneuvering. I have one tree I use for bow which nestles along a tiny pond and swamp area. I end up going up about only 10 feet which is fine as I and sandwiched between two cedars and I have plenty of cover. Opening day last year I had a 7 pointer walk right to my stand and stop. Easy shot, but I needed a doe first. Never saw that buck again last year, but proved my setup was perfect even though I was only 10 feet off the ground.