I want to say this as categorically as I may, because many of you may not know Gary Cheek (kg8 whatever). He knows his stuff in the way that Roper does. It's not theory or untested; he has the skills and the inquisitive mind and the equipment to do the work to draw the right conclusions for himself.
That said, he may not have ever hooked up a mechanical oil-pressure gauge to a V11 Sport, and romped on it hard enough to then see the gauge go to 0 psi and stay there for several seconds as the oil pumps sucks air. If he had, he would have, I believe, been visited with the response that's appropriate to such an event: "This ain't right; I will personally figure out how to fix it."
And he would fix it. His fix may not be a "sloppage plate," as Pete Roper believes it to be. Or it may not be just increasing and maintaining the oil level, as I believe it to be. And it may not be sealing the surface betwixt oil pickup tube and oil screen as another stalwart member of this forum (I am sorry that I cannot remember who it was) believes it to be, but Gary would propose a solution and try it for himself.
I say, "Salute" that we have so many so willing to hep solve the problems Moto Guzzi forces us to contend with.