#1 Learn about basic tribology, - how does a lube work, what is a good lube, etc. Only then can you ask and answer the right questions.
Do you even know what constitute a grease, its components and properties? If you do you should be able to pick a suitable lube from a spec sheet, rather than testing every lube lube known to man, in search for a unicorn that doesn't exist.
https://www.skf.com/group/products/s...uitable-grease
For various reasons, - base oil viscosity and thickener type i vent with Motorex Fett 2000, that on paper has very good properties for a slow moving bearing, in a not so clean environment. Id like to see you test that one, if you please :-)