you have two options here .. one would be to put some hardwood blocks under the servo mounts, shifting it more in line with the elevator horn. Glue the blocks down, however also use longer screws to also penetrate the original servo mount wood.

the other would be to use a heavy duty ( aluminum) servo horn, and run ball links on both ends , that angle would be insignificant as to load

by the look of it , the elevator horn can also be flipped the other way bringing the horns a little closer to being in the same plane ( no pun intended )



~V~