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I think it doesn't matter. I don't have experience with Amsoil but I'd imagine the "racing" grease can tolerate higher temps- irrelevant for your use, but then it won't hurt anything either.
Bearing drag is considered negligible and is ignored in performance calculations.
Once upon a time I converted one of my Tempo's rear hubs to run in gear oil instead of being packed with grease. It sure did spin nicer than the one on the other side when the car was jacked up in the air, but any fuel economy improvement was undetectable. The caplug I used to modify the stock dust cap failed after 10 or so years so I switched it back to regular grease.
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