Uuuuuuh... I would not shim it like that at all.. 3/16" shim will push the pressure waaay up. I'm quite serious about that. Started shimming pump springs a while ago and 3/16" seems way out of line. Sure you got that number right?
What is the point of paying for a blueprinted pump if they are not going to test and set up for a specific pressure relief? If the spring is correct (72 psi), then shimming that much will push it well beyond 100 psi, I bet.
