Good thread guys. I would agree that the only reason to move servos to the tail would be to compensate for a beefier engine in the front. For my tail arrangement, I am going with something a bit different. I have my rudder and elevator servos in line with each other but the rudder servo is higher and more forward. Here's why. I'm using a control rod splitter from Jamarra to run a control rod to each elevator half, the elevator rods exit the fuse higher than the rudder pushrods would need to. I have the rudder servo 1/2 inch higher than the elevator servo and will use a pull-pull cable system. The vertical spacing eliminates the interference between the two control mechanisms since they actually get farther apart as they approach the rear of the plane. I also like the responsiveness that a pull-pull system gives you with a rudder, and the elimination of differential elevator throw often caused by a joiner wire (and me not being able to drill straight)

Anybody try tandem servos in the center of the lower wing to drive both upper and lower ailerons? My idea is to put two servos side-by-side to each run one lower aileron. A connector wire for the upper ailerons would run from the lower aileron, just like the dual servo in the wing set-up.