Quote: If I spin the wheel with a good hard spin, it will rotate on its own for about one revolution.
Sounds better than normal to me.
This really doesn't sound like much of a disc brake drag at all to me! Probably better then most! A disc brake drag is where you stop spinning the tire and it stops immediately, or you can barely get it to turn with the wheel. I think your chasing something you won't be able to cure with disc brakes. Gene