Hi dutchie,
Funny you should mention the stiffness of the suspension set up because when I first fitted the Pirelli Scorpion Zero's 245/70r16's I had the tyre place inflate them at 2 bar as indicated after running them in a bit I started to drive it fast (I bought the tyres purely for dry and wet tarmac use) it did bounce a bit anyway over a long period I have de-flated them and found that running at 27 psi gives tight road holding with a slightly smoother ride and just a few psi over causes a rather jiggly ride.
Its a bit worrying about the gearbox but I tend to keep in D all the time and shift to power at traffic lights to show off.
Having fitted a state of the art radar detector I have not really driven the VX over 100 mph so I have never experienced the fuel shut off but it does sound a pain.