Taking a wide grip on the bar was thought to have pulled your shoulder blades apart, rather like pullover's were thought to have opened your rib cage. Both these exercises have been confined to the garbage bin if your using them with those thoughts in mind. after the age of approx 21 your bone structure is pretty much set and these exercises will do nothing to alter that.
Try taking a narrow grip on the bar for a change now and feel the extra stretch on your lats.
Here's another dangerous movement, but one I do myself (sorry). On the full stretch of your lats you can round your shoulders up almost around your ear's, it stretches and burns those lats like nothing else but IT IS A DANGEROUS MOVEMENT.
Regards
Bouncer