Railbird, you can definitely use the Adcom amp to power your rear channels in a 7.1 system and use the 755 to power the rest of your surround system.

All you need to do is connect the rear channels from the 950 to the input of the Adcom amp. Connect two rear speakers to the Adcom. Configure the 7.1 system overall using the controls in the 950.

Bingo, you're in business.