Thanks for all the suggestions guys.

Looking at other deltas and weighing input, I went with elevons full width. Hatch mounted servos were used instead of surface mount to keep the push/pull forces lined up since the servo and control surfaces are so close. The C/G dictated moving the servos aft. The advantage of surface or capstan mount is being able to use full servo travel (see red delta) and this was the problem I had to overcome with my mod. The problem shows up when using "delta' wing configuration in the transmitter and you put the stick in one of the corners. The result is elevator plus aileron and the servo travel is extreme. I can reduce the max travel at the expense of elevator and/or aileron independent full travel (see yellow delta). I don't want to give up these large defections because of the thrill of high roll rates or abrupt pull outs. I tried all kinds of mixes and tricks, even a servo programer, but there was always a sacrifice. My old JR 8103 transmitter just cant set absolute servo travels. So I had to cut slots to let the servo arm and push rod disappear into the wing.

For test purposes I spit the elevator at center and joined the ailerons with 1/32 ply on both sides. So surprised buy the stiffness that I'm going to throw some quick covering over the bear spots and test flight before pulling off the old covering and controls surface for revamp.