NGLI vs base oil viscosity and bearing drag

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Hello
with the goal of trying to achieve the lowest possible rolling resistance in a ball bearing.
say,
6802 32mm OD X 20mm ID X 7mm
6804 37mm OD X 25mm ID X 7mm
with light contact shields
Turning under 400RPM
ambient temperature
Relatively light loading
infrequent use

I am looking at low base oil viscosity.
what role does the thickener play in the rolling resistance?
I would imagine that a thinner thickener would be better, but how much?
 
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