I'm saying that's a lot of reps, good shit bro, You really train 3x a week? To improve pull-ups I would suggest a weight belt like Cornholio said. I also would suggest some bicept exercises since these muscle and the one in your forearms are the one that usually fatigue first. But if yours don't then try doing one arm row after your pull-up routine because you can strengthen each arm more by concentrating on them individually. Hope this helps.