Actually, I didn't use the book settings. I just eyeballed it and adjusted it manually until I had decent signals. I could probably improve it slightly with a little more tweaking but we're moving soon so I haven't bothered. I recall from previous installs that I elevated the dish a few degrees higher than what the book said. But that can be affected by whether your mast arm is perfectly vertical or not.
Are you getting anything at all on 82 and 91 at the same time, or is it a case of one or the other?