Dan, I’d back what Pete said. The standard GRiSO shock design has a very short travel. I have a Wilbers on mine, and if I had my time again, I’d try to get a slightly longer shock, like a Stelvio spec. Also, whilst Matris have a reputation for over-springing, Wilbers drift in the opposite direction. If you go Wilbers, add 10% to your quoted riding weight.