I hunt that height all the time. I don't know why it would be too high, as long as the tree has the diameter at that height so support you. Start with the most uniform tree you can find, and tilt the stand up quite a bit to compensate for the slack that will be acquired as the diameter of the tree sinks. You will only be able to allow for so much, because if you tilt the stand too much, thus tightening the cables, you won't be able to climb because the stand will be too tight to the tree. Adjust as much as you can, and as you are climbing, when the stand goes past level and tilts down, go back down the tree until the stand is level and stop there.It is quite dangerous to have the stand leaning down, as the teeth don't grip as well. Oh, and you are wearing a fall restraint system, right??

edit: The key to using a climbing stand is the tree. If you start with a bad tree, you will get bad results. That is the downfall of climbers, IMO. The tree has to be pretty straight, and uniform in diameter. Some trees are really, really fat at the base. Stay away from those, there is no way to compensate. Be finicky about the tree you climb, and you should be ok. One area I hunt is full of Jack Pine, and those are the greatest climbing tree there is. Just make sure the teeth are sharp, and carry an extra cinch strap to tighten the stand when you are at height.