An alternate idea from one who wears his backs with the iliac creast in the middle of the hip belt: Try moving the load lifter attachment point on the Deuter closer to the top of your shoulders. From your pictures, it looks like it is down in front rather than at the peak. Then loosen the load lifter, tighten the hip belt, tighten the shoulder straps, and only then tighten the load lifter. The load lifter should bring the pack in tight to your back rather than lifting the shoulder strap off your shoulder.
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If I wouldn't eat it at home, why would I want to eat it on the trail?