I have a Fortec 1.2m dish with a Stab H-H 120. It is perfect when going downhill. And trust me Popcorn, it sometimes takes minutes (seems like an eternity) to climb the arc. And if I go, like to the next bird or 2-3 over maybe, it will capture it OK. But, if it travels 20-30 degrees or more (at least traveling up-hill) it does not capture any bird. I have to reprogram it to go for another bird (usually the one closest) and it will go there, then I reprogram it to go back to where I originally wanted to go. Maybe I'm not giving it enough eternity in it's uphill travels or I'm too impatient. After reading the thread about "Stab HH120 and slack", I'm not sure the two aren't related. Although, I don't know if mine has slack or not, it kind of makes sense. In the end, I'll put up with the slowness and the not landing on the sat to enjoy the better picture the 1.2m gives me. What I'm saying is if you try a Stab H-H 120, it may not be much of an improvement, if any. It doesn't sound like you will try, but in one of your post you at least had a thought about it.
Al