Morning !

You are good with your CG. Mine on Voodoo is also there. Maybe a bit more in front ...

the material you found in the crankcase is used between all parts of the Motor. But I don’t think this cause such a power loss or bad running behavior. It’s not a 2 stroke engine where the gas goes through the case. So take care that your carbs are in factory setting. All 3 cylinders are fireing?