So I went to ask more people and it seems that not wear on the drum is the issue but wear on the axis of the little camshaft that separates the breakshoes.
To be more precise, the aluminium cast (which is the base of the brakeshoes) has a hole where the axis passes and there it has too much freeplay.
if I translate it from german, it would be something like "brake anchor plate"
And as a second reason, I found out, too much compression from the axle on the wrong parts of the hub.
In my mind it starts making a little bit more sense.
At least I feel a little bit less stupid after losing two good rearhubs....
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