I do not know if you have tried it this way. First of all read this:
http://ascom-standards.org/FAQs/TheSky.htm
Install the teleapi plug in, then and select poth (plain old telescope handset) in the ascom chooser window as your telescope/dome driver, read below for a basic overview of poth.
http://ascom-standards.org/FAQs/POTH.htm
Basically in the poth setup you select your telescope driver, which in your case is gemini, and also select your dome driver in poth. Poth will read the mounts location and slew with it.
Brett