Talking to the ever helpful Craig, it is apparent that whilst the double wishbone rear is a great idea, nobody ever actually completed the design in that, the top mounts of the dampers are too high to stop the wheels hitting the bodywork, and I don't think droop was thought about to limit damper extension to stop drive shafts pulling on the CV joints.
AVO can add more bump stops to the top of the damper rods, though really the triangular top damper mounts need to be revised to lower the top damper fixing hole.
AVO are also going to put stops on my damper rods to reduce droop a bit.
I will see where that all ends up.