Yes, manual for
SM3D22 says, it will rotate 6° when switching from one LNB to another, and I don't know, how to disable or modify this internal setting.
I will receive my SM3D22 in a week or less, and will need to figure out the way for myself, because my LNBs are only 4 - 5 degrees apart, attached to each other with electrical tape.
However, we can always trick the motor by giving a "wrong" position for satellite in receiver USALS settings:
let's say you need to receive from 110°W: try to set position for this satellite, as it is at 104°W (or at 116°W, depending which direction this 6° move is).
Also, I would swap inputs from LNBs, so linear LNB connects to port1 and circular output connects to port2, because there are much more "linear", than "circular" satellites up there