If you imagine the ailerons centered, and the control horns sticking straight up, you would have the rods going straight from the servo to the horns, if I'm picturing your setup as described. On my 4*, I put an S-bend in my horns so they went from the servo back to the horns at about half their height, then another bend to angle up a bit back at the control horns.

Edit - (I tried to make an ASCII drawing of what I'm describing here, but the board clears extra spaces, so it looked lousy)

At least for me, it seems to let the arm flex a bit, that takes the stress off the servo end of the control arm... If I remember, I'll take a pic when I get home tonight....