Milking the dead cow here, I can't imagine mine is a bump stop issue because those come into play on more sever bumps, and the ones that are sending my rear off track are kinda mild.
actually, you would be surprised how 'little' of a bump it takes for a VX to hit the rear bump stops. Maybe sue can help me with a photo, but some VX's sit within a couple inches of their bump stops at a rest..... just worth taking a look