Good find, Al. I thought it was interesting that the VI of the PAOs kept improving as the viscosity increased. For example, The VI of the 4.1cSt SHF-41 is 126. The VI of the 2800cSt SuperSyn PAO, SS 23000, is 360.
Also, the pour point of the 4.1cSt PAO, SHF-41, is -66C or -87F. That's better than any of Mobil's esters and way better than any of their 4cSt esters.