I think some of you are making this more difficult than it has to be.

Your viscosity should be bases on your clearances, if known.

We've used (for our clearances) VR1 as break-in and normal running with no problems,
hyd. flat tappet, 6500 RPMs and solid roller stroker 6000 RPMs

Just our experience, I know many of your builds are more extreme, but VR1 has been flawless for us.

Just my 2 cents, Joe