That is what I currently have it, the whole issue is volume, lets say the first level of volume you can hear is 40's or so I have 7 Klipsch CDT-5800CII which because the sc-35 was on it I know they can handle more.You should be using the factory default AMP ASSIGN = 9.1Ch + Zone 2.
SURROUND BACK speakers require having SURROUND speakers also configured in at least a 7.1 setup. The only configuration for you that would allow this is:
Front row pair - Front L/R
Middle row pair - Surround L/R
Single middle - Center
Back row pair - Surround Back L/R