As part of my back training one of my main exercises are chin-ups. The problem i have is that they are very difficult for me. The reason for this is that few years ago while i was in the Marines the doctor informed me that i have a genetic gap (very small) in my rotater cuff which makes them more difficult(still doable). I can still do them without pain or injury however am worried about how well my Lats will develop. Right now i just do them assisted in sets of 5-10 for a total of 50 reps.
Basically what i am asking is should i replace this exercise with another Lat exercise or should i continue doing them normally and i will still develop as i should?