I have a Scubapro Hydros pro back inflate bcd, D Rings in all the proper places. I sling my 30cu diagonally, primarily so there is equal weight distribution between both sides of my body; eliminating the need to counter-balance. If I ever had to hand it off to a distressed diver, my trim would not be out because of counter-balancing.
There’s no need to counter balance. I had an AL30 slung on my left side for a couple of years before I went to an AL40. The 40 hung better but the 30 wasn’t an issue. But then you’ve got an expensive poodle jacket. You may *think* you’ve got D rings in the proper place, but compared to a BP/W, who knows?