About the tail....
As an ex Mech Eng I have no worry's at all about the tail wobbling about. Its just logical that it should do that. Elevator up high, vortex shedding from wings its doesn't matter what you make the tail out of you will always see movement because of the length of the elevator.
Its like the chem thrusters of the space shuttle deflect over 1.5 meters when they open the taps.
In fact I have flown next to another T tail seminole and it wobbles around as well.
And the 146 tails waggle. Its just because you can't see them that folk don't worry.
Bitching that the tail waggles just allow's the listener to gauge a) your level of understanding about aerodynamincs and B) you technical knowledge to do with stress/strain and torsional stress levels and also the fact that distance from the point of rotation acts like an amplifier of displacement.
I have had success showing folk using hands out of car windows and twisting bunches of strands of pasta about A)
And limited success with B) by using a seesaw and flagpole as an example.
There are still some people out there though that just don't like the look of it and will refuse any sort of explanation why its meant to be.