Wow Bibbler, that's vicious !!!
If I pulled up in your driveway to install your dish I would say "Sorry Sir, there's no way to get a shot here" and haul ass outta there...
Congrats on getting signal. I would keep the dish where it is and put a stationary dish on the hill for G10R. I would not want to power a motor through 400 feet of coax. Use RG6 for the stationary dish and forget the amps - they suck. I've run upwards of 800 feet of RG6 and amazingly enough had some signal left at the other end...
kat