...to follow up...

The over and under leadout setup mentioned had no ability to counter the gyroscopic precession yaw tendencies.

Bob Palmer, who designed two Thunderbirds and probably also the Little T-Bird, tried the over and under leadouts for the Thunderbird II, but went back to fore and aft layout in hiw later designs, ASIR. The "trailing in the front line's wake" idea seems to have more benefit... Also, if the model for any reason starts to twitch in roll, that gives a slight up or down control input all by itself...

(I'd been timed out in attempting to put all this in one post, so I'm running hard, here, gasping and fighting cricks in my legs...[:-]

So, enjoy! Worry about real things, and enjoy the tactile joy of having your model actively fighting your personal arm muscles!