It's weird how people with huge backs can't do many pullups yet here I am with only a 47" chest/lat measurement and I can bang out 20-25 pullups easy no matter if my weight is 180 or 230. It's also weird how some things grow well on people and not on another. I am the complete opposite of you guys, I can't get my lats to spread out for anything but my arms are like tree trunks compared to the rest of me.
Frustrating stuff! Oh well it's what seperates everyone