Simon,
In my opinion only two checkboxes are required:
Az: Deadspot North (or South)
El: Max. (90 or) 180 deg
Flipmode should always be enabled with a 180 El rotor
when the track crosses the deadspot.

73 de LA6GH
Nils
PS:
BTW I'm SO pleased with the QO-100 beacon tracker, it works beautifully !