USALS, at least in the STAB HH90 manual and the STAB website is meant to rotate the dish +-65 degrees from the origin. So depending on your location, if you try to point to a location that is more that the 65 degrees, it will not do anything. I am located at 71.7 W, and in the SV4K menu, if I select a satellite between 71.7-65 and 71.7+65 (6.7W and 136.7), when I ask USALS to go to sat position, it moves the dish to some position near by (my setup is currently not perfect, so it often misses the high point). To setup a sat beyond -+65, I use the same process that you outlines, but with the Motor option as opposed to USALS