I assume you're working with something bigger than a pickup, right? You might be experiencing a situation where the shoe isn't concentric with the drum once the adjuster is loosened. On medium-duty truck brakes with the Lockheed cam-type adjusters it was not uncommon to get a little drag after tightening the adjuster to achieve drum lockup and backing off to let it turn. The problem was that the shoe didn't retract evenly and gave the impression of the drum being out of round. If the pedal height is good and the drums don't heat up after driving for a while, you're probably good to go. I assume you're not hauling max loads routinely, right? If so, you'll need to back off the adjusters a little more than usual to allow for expansion of the brake shoes when they get hot from heavy braking.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!