av8tor1977 I have ran into the same issue using the same Radio, If there is enough room I will turn the servo around and put the arm on the other side and remake the linkage hookup. I'm not sure about world expert products, but my local hobby store has an Expert line of servos extensions and reverser's, that I like better than the JR line they carry. I have use all of them with good luck in several smaller glow planes, but only one 30CC gas plane. It's fore sure I would change out the one you have now for another and see if things stay in line better. There is also another option the better grade of Hitec servos are programmable and can be reversed fairy easy, but a person has to have the servos and a programmer to do so.
Good luck either way you go.