Interesting stuff -- looks like there's a lot of tail deflection with that free flying rudder -- I guess that's why most modern planes have a vertical stabilizer
With light pedal forces, I'd wonder that there aren't issues with over-correcting, or oscillations, in yaw, and I'd wonder also if that's where some of that turbulence sensitivity is coming from.
As for the second takeoff, I can see what you mean there -- looks like you didn't have any rudder authority at all until you were nearly airborne -- Yikes!
There's a little taste of "Test Pilot" flying for you -- that's a nasty little "gotcha" to discover, because (iirc), usually you want to pick up the tail fairly quickly, but in Bebette's case, you need to delay that until you've reached a minimum "rudder speed" -- hehehe, I think you may have just invented a new V number -- Vra (
Velocity for useable
rudder
authority -- forget "rough air speed")
Cheers,
4 <S!>