If your loan is A-paper, or, especially Fannie Mae or Freddie Mac conforming, your broker is probably correct in that your rate is unchanged at 640 or higher. Those loans either "you get it, or you don't" for the most part.
As far as the YSP question, I'd be suspect, but even that depends. He may just not know yet or know how to explain it. Or could be being shady, it's hard to tell without being there.