When I ran chians on my 445, I would let most of the air out of the rear tires, put the chains on, then pump up the tire. That worked great for me and I never had them slip if fall off.
I see a lot of the same things you are doing on the larger ag tires that have chains in my area.
I see a lot of the same things you are doing on the larger ag tires that have chains in my area.