Alright well I'm 5'8 and 175 lbs right now. I can do over 6 pullups with at least 70 lbs attached to my legs. over 20 pullups without any weight. I do a chest supported row with around 4 plates. I bench almost 300. I deadlift almost 4 plates on each side. squat around 3 plates on each side. I know I am still skinny but proportionally my upper/mid back is lagging.
I am alright in the strength division I think, but it seems like every back exercise I do targets my lats and rear delts. I just tried behind the back shrug with a barbell with a 2 second pause at the top, and I bring my arms up as high as i can. It seems to work pretty well,, but it felt like that would still not help bring up my mid back.