So I'm making a Quadcopter-like aircraft which uses torque for its pitch/yaw controls, and for it to work i must use custom rotator props/engine, so far it's working brilliantly, however for some reason the small rotators I'm using for collective/Roll controls are super glitchy, and allow my blades to stretch out from the aircraft and collide with each other when placed close together, this is making it really difficult to make the aircraft more compact, and therefore preventing it from being usable in an actual build, does anyone here know how to prevent this stretching?

Link to craft and pictures:
https://www.simpleplanes.com/a/EYK7m1/Rotor-Problems

-this was as close together as I could get the rotors without collisions, you can see that the blades are not always stretched during flight, and seem to stretch quite randomly (it took a few tries to get a screenshot of the stretching)