I have line of site from 166E - 55W. The outer limits are beyond the range of an HH motor.
So this means a range of (360-166) - 55 = 139 degrees arc.
Outside the USALS range, you can use GotoNn diseqc 1.2 commands. Assuming the motor limit switches and the motor 'software' allow that ( I don't know how various motors handle that).
(From what I've read (if I recall right), USALS applications usually don't go further than ± 60 or ± 65 rotational degrees I believe, so a range of 120-130 rotational degrees, which alas covers even less degrees arc. However I don't know if I recall right!)
If all else fails, you might mount byrider LNBs to look beyond the motor limits. Though that might not be what you wanted, with your motorized setup.
Other possibility: I've read about setting the dish not aligned to the motor zero, to get more range at one extreme. Remember that by doing that, you might get "acceptable" reception at that side of the arc, but the dish will be rather unusable for the other side of the arc. I'm not quite sure, how you would want to tweak the dish setup for something like that; I've never thought about that, specifically.
Greetz,
A33