Damn, I was just reading Karky's journal, and he was saying pullups were getting harder for him.  Now I'm checking yours and you are saying they aren't improving either.  And myself, when I was bulking, I made zero progress, in fact, they got harder as I gained weight.  I was gaining muscle, but not getting better at them...damn, what is it with pullups?  Haha, sorry for the rant.