Also, dude size don't make the person. Be proud of your 164 pound frame. It's better than being 230 and look fat and out of shape like most people on here looks. Anyways good luck bro and I hope to see the end result at the end of your cycle

No way is this trying to degrade you. But to give you honest feedback. I do see very little muscle definition or muscle on your back at all. I don't know your diet or back routine or how long you've been lifting. But from the pictures it doesn't look like very long. Ok, first off when you are on and off cycle, stuff your face with as much protein as possible. I normally eat Tuna out of the can until I feel like throwing up. I have a fast metabolism so I need to consume alot. I can tell you're lean so up the calorie intake please. Also you need to hit at least 5 diff exercises for your back. Try hitting inner back outer-back and lats, lower and traps. My back workout is 80-90 min. Up the weight so you can do 8-10 reps without compromising form.. Switch it up every two weeks where you burn out. Always keep your muscle guessing.

You're coming along. Try to squeeze your right trap extra hard when you hit 'em, the right looks a bit smaller than left. I have the same issue from a couple injuries.