Thank you Andy that's what I thought (feared!) too, running near the limit for the M63HV pump on a 'bleeder'....I will likely just go back to a 50 grade but I may try a 5w so I at least get better lubrication at start-up.
A clear valve cover is a good way to see what is going on with the lubrication system. If you have oil spraying around at hot idle then you should be good to go.