I'm doing 5 sets of pullups with each set to exhaustion. However my pullups really decreases after the first two sets. I would start off doing 7, then 5, then i get to 2 or 3 if i really try for the next sets. I'm resting about 2min between sets, and I rest 2 days before my next pullups sessions.
If I rest much longer, I can pull off more. But is that good?
Ultimately my goal is strength, and slowly I've been increasing my pullups number. But how do I perform better for the later sets?