You need a tube inside the fuselage to run the servo wires through.

Make a tube out of a piece of paper. Cut it to length and then unplug the servo leads at the reciever. Slide the tube over the wires and then plug the wires back into the reciever. Glue the tube into the fuselage with some thin CA.

Ba-da-bing! You now have a tube that will hold the servo leads up and away from those pull-pull cables.