No point talking to IIO's
I called last week regarding my EAD, and also happened to ask about my I-485 (my RD 08/2001, ND 09/2001) and the IIO said NSC is processing January, 2001 cases now, which is totally ridiculous.
So my inference is there is no point talking to IIO's, they cannot change anything as far as expediting one's case or even help by giving accurate information.
Just take it easy, your turn will come, like everyone's turn comes eventually.
Good Luck.