Really surprised CG is a issue on the electric mojo 40. I picked this Jo 40 up from a club member needing to be completely recovered. Yes it was built with the wing upside down haha. It has standard hitec servos in original locations. G32 - 3300 4s and balanced out good at 5.5 with the motor all the way back.
On the primo 40 E , still got away with stock servo locations but used micro instead of standard-
make sure to keep us updated with a flight report and how ya like it!