I'm having problem contracting my back. Some workouts I feel everything in my back, get a wonderful pump and pull great weight. The next workout I feel one side of my back and not the other, I'll have pain in the trap on the side that I do feel (right side) and my other trap (left side) will feel non-existent. I've tried pull downs, pull-ups with pauses, pull-ups going half way down and back up again, it's seems as though nothing will work.
The strangest part is that there are no visible differences in the musculature of my back it just feels extremely fucked up. I'm thinking that I'll try barbell rows for a while to try focusing on scapular contraction on both sides simultaneously instead of one handed work which has made up most of my back routine.
Thanks in advance for any suggestions.