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Mac, I'm gonna go back to your ebrake for a moment. You seem to suggest that, even with the adjusting wedge being fully retracted, you still have drag on this wheel. Since your focus has been replacing the grease soaked service linings, are you sure the same drag wasn't present before .............. but from the ebrake rather than what you assume NOW to be the service brake. You might try removing the ebrake band and reinstalling the drum to see if the drag still exists.
Then again, the new linings have not been arced to fit the drum. If it's an original steel drum, chances are good it's fairly worn oversize. In this case, you could probably take a file to both ends of each lining and chamfer the lining down from full thickness at about 1 inch in from the end to about 1/8 inch thickness at the end of the shoe. This would go a long way to seating the shoes against the drum better. Just a thought.