Mines a YOKE and that may be the source of my "headache", I can deal with it if I have to. It's got a ScubaPro Mk16 attached... not exactly the lowest profile, but not THAT big.
I'm not ready to switch to DIN yet, as I'd have to switch all my deco/stage regs as well to maintain interchangeability ... and when I rent bigger tanks for some dives, they come with YOKE valves of course.
And the more I think about it, if I loosened the shoulders, the only way to keep it in place underwater would be to tighten up the crotch strap ... and as I understand it, that's not right.
Anyway, I'll work with it some more next chance I get. Even having to "watch" my head, it's a lot more comfortable than the GlidePlus I've hung in the closet.