Vero Vellini air cushion or premium air cushion slings.
vero velliniI had a buddy recommend one of those. Do you have experience with them?
Yes, I have a couple. The neoprene section is a triple treat - wide and cushioned, stretches for some give with heavier rifles, and provides a non-slip back.
Got my father to switch over to one also - huge comfort change from his old school 1" leather claw sling.