Have you tried mrc silvers in back? I didnt like mini silvers on rear, seemed a touch to soft. You could also lay fronts back one hole. This is assuming the fronts over powering the rear on verts.
I have some MRC silvers I can try.
Try lowering your rear uppers one hole on the chassis. Try to make them as horizontal as possible. Raise your front upper link mount at the axle with a small (2mm) spacer. See how that does.
Cant lower the rear uppers at the chassis anymore. Already in the lower hole. I can move a hole back? Ill give the front mount a raise too.