@TrailBeast did you bolt the pump to one side of the hose and the other side of the hose to the frame so that the pump is sorta hanging? For example, you could stick your fingers through the interior of the hose?
I may try that to quiet mine down. I bought a cam extension for my Magnum cam but haven't installed it yet. "While I'm in there" I want to replace the water pump hand harmonic balancer.