This has come up on the "Elan has arrived" thread and the opinions have been divided, except that the incidence pins need to be glued into the stub wing, to prove this rig the whole ariframe and grab hold of you tail and move it up and down, it shocked me how much movement there was.

I would not use anything else, but metal geared digital servo's on a main control surface.

I don't use a UAT and all my batteries are in the back under the tank, using a P120SX, my Elan has never flicked out or run out of elevator, all set up as it came out of the box, roll rate is very impresive and so are flick rolls, humpty bumps can be performed very quickly in fact on one reversal according to my GPS I have pulled 9.6G without any flick out or problem, so the long and short of all this is check your incidence pins I think your booms are moving.

My two penny worth.
Mike