Tighten the starwheel until you get a firm drag, enough that it takes a little effort to turn the wheel. This seats both shoes firmly against the drum and pushes the pistons into the wheel cylinder fully, but does not lock up the wheel. Then retract the adjuster ONE FULL TURN of the starwheel- - - -usually 8 to 10 clicks. If that seems like a lot, remember that it's only one thread on the adjuster bolt. That's less than 1/16". Ignore any "drag" or scuffing noises, as there's no telling where the shoes on a Bendix brake will end up once the tension against the drum goes away. The bottom of the shoe assembly "floats" and self-centers itself when the brakes are applied. Just backing off until the wheel turns freely doesn't allow for enough clearance to prevent drag as the shoes heat up after a few stops.
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!