Larry, most of us are going with the recommended 530mm forward of the TE, but you can go up to 570mm comfortably.

Mine has the CG at 570mm with a full load of fuel and goes back to 530mm when I am allmost dry, no real noticeable trim change.

I actually had my SR set up originally with two 6 channel recievers running together but that was due to the servos I was using not responding well to a "y" harness (digital Hitecs and Airtronics pcm receivers) when I went to my current JR 10x setup I am back to one receiver. I didnt notice anything abnormal with range, etc.

AJC