Why do you think they are the wrong height? Got a do what it takes and if what your doing isn't cutting it, change.
I killed a deer this year out of a stand I had just put up about 10' under another I'd hunted out of for many seasons and think if I would've climbed to the high one the bedded buck not fifteen yards away would've busted me. I put the lower one up because I couldn't get the shots I thought I would need.