Am I the only person who gets pissed off by the fact that you are rude and often ignorant? I know you've got a lot of knowledge and some decent lifts, but I'd appreciate a little more respect - I'm sure a lot of people here would. I know you think you are just a 'no frills' guy, but you aren't simply someone who tells it like it is. You move from indifference to impoliteness.
Decline raises your shoulders slightly above your head. If you maintain a close to vertical upper arm position, it means the distance between your elbows and your forehead/face is greater.
If you'd tried them, you'd realise a slightly greater ROM. It obviously differs from person to person depending on the individual movement, but it COULD increase ROM.
Crickey, I thought you of all people would realise that, having deadlifted 200kg+ and gaining the experience that you state comes along with it.