wired4fta, the Stab HH90 specifications say you can set your software limits to between 5 degrees and 65 degrees. So, if your system is stopping at 60 degrees, then you can probably extend it to 65 degrees.....but that's the limit. As for the sg2100, its manual says its range is plus or minus 75 degrees.
Others in this forum can give you much better advice than I regarding most aspects of FTA. I don't even have a FTA system...yet. (UPS is supposed to bring mine tomorrow.) But for many years I have had a BUD (big ugly dish) for C-band, and I also have a Ku LNB on it. Thus, I do have a firm grasp of how to allign a dish.
Tomorrow, if my Coolsat 5000 and sg2100 get here, I'll mate my sg2100 with my old Primestar dish, which is rather heavy. I've already made a new light-weight mount for the Primestar dish. Once I get the setup working, I will post some pics of my new mount. I'm proud of it. I basically improved on a mount shown in this forum by "dirtyshame".
Anyway, good luck with your setup, wired.