I do them time to time, but for some reason I don't get the desired feel. Maybe I'll try with deadlift bar, to 'lock' myself in.I do Smith rack deadlifts and typically do 10-12 reps. If I go under 10 it's almost always because I'm moving up to a new weight or intentionally testing my strength at low reps. I've found 8-12 reps on rowing and pulling movements to be ideal for adding size to my back.
I recommend you try rack deadlifts. By taking the lower body out of it you can focus more on pulling with the back and get the gains you're looking for.