never really pushed to be able to do more, once i hit 12+ from a dead hang i started adding weight. 45 plate for 6-8, haven't tried more yet because i want to be able to get at least 5.
truth is if i use pull ups in my back routine they get easier and easier, if i take them out for a while, when i go back to them, 12 from a hang is WORK.
sets of 8-12 are usually my warm up exercise for back day.
For the record: I hate seeing kipling bullshit pull ups. if folks are doing those then i want them to stop, do 12 from a dead hang, if they can...well then, kipling away i suppose, but it would stop me from thinking they look stupid. crossfit has it's place but all these wingnuts are invading gyms everywhere. have fun w/ that shoulder or back injury folks, on a continuous time line the fanatics who got into crossfit to get ripped will eventually be out of the game because they fucked themselves with a massive injury.