You should lift fast; it recruits larger amounts of muscle fibers and motor neurons, allowing you to lift more weight, allowing you to get stronger, and you know, lift MORE weight.
Also, dear lord OP, more than 30 pullups? That's insane! 20 is a big benchmark for even very many fit people. I've been hitting serious about lifting for about the past year and a half and I can do 5 in one set, ha!
Anyway, any of you here squat? If so, how much?
My personal best when it comes to squats is around 140-150kg, I don't remember the exact weight and rep count, but I know it's very close to my personal best when it comes to deadlifts (150kg/330lbs for 4 reps and of that I'm 100% sure). Maybe one could add bench, deadlift and squats to their posts? To get a better perspective of strength overall, as said, someone with a light body will have an easier time with the pullups, but coupled with compound lifts it's a tad bit more accurate. I don't have a very strong chest though, so heaviest benching I've done was 100kg/220lbs for 1 rep.
And as for the OP, I've never pushed myself too far with the pullups tbh. The highest number of reps in one set has been around 20 I think, but then I was saving myself for a few more sets to come. I plan to try to max the reps one day, when I have the time and the energy to hit the gym.