Setting the rebound must vary from car to car. I followed a schumacher video on it but trying to replicate on my tc5 didnt work at all. Needed to put 2mm clips on the shaft otherwise the rod would hit the diaphram when i tried to bleed it.
So aiming for 2-3 mm netted ne half the shock travel. Shocks seem very fiddly and after one race theynseem to leak and the settings are all off again.