RE: Aft CG and aileron effectiveness
I will buy that
To go a bit further --the "induced" loading (I hope this term is not offensive to the academically trained) changes the way the plane responds- primarily (I think) because drag is shifted more to rear of aircraft.
Sorta like having an arrow where the feathers could be slid along the shaft and change the center of pressure vs the center of gravity.
Our own cut n try approach to solving questions bears this out.