Goodwork on the chins. When I first started doing pull ups and chin up I would have one session where I did 3 rounds with heavy weights on me to the extent I could only knock out 5-8 reps in a set before failing.

But then when I next came to do them in another workout I would do 3 sets of BW and go to failure. I picked this up from somewhere else but it is a great way to increase the amount of pull/chin ups you can do.