I think this is a good point Jo and I think everyone should be evaluated by a professional and my experience is in no way professional advice just to clarify. I definitely started out that way and until I got my pec minor loosened up I was in a similar boat. This isn't the type of thing that is fixed over night. One thing you can do to see how your scapula's are moving is to film your self from the back while you are doing the movement. You will be able to tell if one side is clunky or lagging.