Thanks a lot for posting this info!
I can tell that 6º jump works fine for my setup with the second circular LNB, attached to the right side of the central linear LNB (if I stand behind dish and look where it looks, it's right, or west side). I am receiving a signal from these satellites without re-setting their coordinates in receiver. If the shift would be 5 or even 4 degrees, still I would receive it , because it's strong from these satellites. I think it's even less than 6 degrees, because when I switch from 116.8ºW, set to DiseqC port A, to 110ºW, set to port B, motor does some significant movement to the West, more than 0.8º.
What's interesting, I tried to make a travel distance as short as possible by setting a satellite position to 111º or 112º, and still motor makes some minor jerky movement, when switching between them, with a short buzz sound.
So, for my situation, motor works great, because I don't need to change sat positions in receiver, but for
Invacom owners, it's not going to work, and they need either do not use the built in switch, or compensate for the shift in the receiver settings, i.e . for Echo10 they need to specify it's position as 115º - 116º W, instead of 110º.