Looking good. Great development in the lats. You look much wider. Arms are obvously much thicker. good stuff.
Aside from continuing with the heavy stuff, do some relatively light weight cable rows and do slow controlled reps and focus on using all the little muscles in the middle of the back to pull the weight.
There's something in bodybuilding called diversity. You don't always have to go heavy. Dropping the wight down and doing high reps forces the weaker muscles to participate to a greater degree.
When doing my back workouts, I usually go heavy, but at the end of the work out, i get on the cable row, put it on like 100 pounds (I usually do like 220+) and just a sick amount of controlled reps. Like 30+ reps, and get every last muscle fiber in my back stimulated and involved. I have seen greater definition and development between the shoulder blades from doing this.