I considered, tried, and then dropped a swivel from my reg setup a few years back. Of the swivels, I really liked the Atomic model, available in a universal host product for about $99.
I also tried, and dropped, a Scubapro angle connector that helped a bit in correcting the induced push of the reg hose but was still too restricting.
I've always suspected that my problem might be solvable with a correct length of hose - the standard length can bow outwards and push the reg to the left.
I have now ordered, and am optimistic, about the new Miflex braided hoses that are appearing on some new regulators, such as the Aqualung Mikron. They are more flexible under pressure than rubber hoses and I'm going to play with a few different lengths and see how it goes.