I have a manitou sherman front fork. I am 180lbs. How much air should I have in the chamber. At least a point to start from. I rode yesterday, and on a 4' drop, it would bottom out. A friend said he thought it needed 50psi. I checked it and it was at 60psi. So I pumped it up to 80 and rode and off the same drop there was pretty much no difference. Same bottomage. I think something may be broken inside. I know these are not a very great shock but it has not much hard riding on it. What are common things that go bad with these? It is an 04 sherman slider. The headset seemed to loosen up too. I tried to tighten with not much luck.