I tried this and it made so difference. Finally I moved the dish with the actuator until I was somewhere between 97 and 101 (not showing any signal from either that is) and in spite of not showing a lock on 99, I blinded scanned it anyway. Mysteriously, I got the channels from 99. I still don't know why I can't show a lock but the channels I wanted scan in.
In my experience the Lesea channels and the My TV feeds are pretty strong compared to other channels on that bird. I would try to lock those ones in good first and then see if there is an adjustment issue.