RE: I've got a World Models Ultimate 40.........
Why not read the other threads instead?
It's well worth it to take the time to do so.
You'll get both any issues and how to correct them there.... not a synopsis and then a series of followup questions, which will turn into that same thread...
FYI: The aileron mod is not required on this plane... nor are the multiple aileron servos. A good hi-torque mini will do fine... but read up on this on the other threads.