Proctor, although seeing your picture of the twin ear modification maybe the rear flexI mount does provide some kind of stabilising too?
I must say I've not had any wheel hop, have you tried it with MDM on or DTC off to reduce traction intervention to see if that is causing torque oscillations in low grip conditions?
BTW great to see an enthusiast looking at the most mportant (and telling) side of a car - not the shiny side
I've always said if you want to see the real design intention / the way a car is built - look underneath it!