I have two 951 carb engines I am assembling, and both are about .090 squish with a head gasket installed and no base gasket. I think the spec is .067 to .091. One has a WSM crank, the other is SeaDoo. Pistons in both engines are WSM. Based on what I know, I need to deck them about .030. This sounds odd and seems to be a lot of aluminum would need to be removed. Thoughts?