I've always been careful to clean out the upright and file down the mounting surface so the new housing will fit well. Never torqued the M12, as I don't know the value and I'm not even sure I will be able to fit my torque wrench in there, but I've always been careful to tighten several times diagonally to pull the new housing evenly into the upright. Will also try to torque the hub bolt the way you describe more carefully. Both the hub and the upright looks fine and undamaged to me on both sides of the car.
Thanks for the info MikkiJayne!
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
Focal and JBL speakers, Helix amps
S8 anti-roll bars front and rear
Complete rear LED taillight
Xenon fog lights
All interior LED
S8 rims 9x20"
Stage II tune
S8 Grill
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