You're probably not hitting back as often as you can. You can train back more than you think. Prioritize back for six months, eat a ton, then post another pic.
This might help get you pointed in the right direction:
"Upper back is one of the hardest body parts to overtrain. It can be trained up to four or five times a week. Splitting exercises by plane of motion into rows, pulldowns, and pulls gives us a basis on how to do this. Rows include bent rows, supported rows, T-bar rows, pulls to the face, and cable rows. Pulldowns include pulldowns with various handles to the front and back, pullovers, chins, and pull-ups. Pulls include barbell cleans, kettlebell cleans, high pulls, upright rows, dumbbell power cleans, and even the Kelso shrug (shrugs done with the upper torso at a 30-45 degree angle and the back arched, allowing the rhomboids to enter the movement).
You can hit upper back two to three days consecutively by doing a row, a pull, or pulldown one day, then hit your back the next day with a different motion. For example, if you bench Monday and Thursday, and squat/deadlift Tuesday and Thursday, you can work rows after your upper body and pulldowns or pulls after lower body. Then you can hit an extra workout for upper back Saturday in the plane of motion you didn’t hit Thursday or Friday. You can customize this to your preference as the permutations and combinations are endless.
Bill Starr recommends about 50 total reps for upper back in a workout, and Bill is hard to disagree with on any subject. Reps and sets of 10 x 5, 7 x 7, and 5 x 10 work well here. You can even do two exercises with 5 x 5 if you're feeling froggy.
Start hammering your back like this and not only will your traps and entire upper back blossom, your biceps will follow suit, even though you might be dropping some arm work after 50 heavy reps of upper back!"
--from this article by Jack Reape
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