I'd not be using ICNR. You are using valuable time that could be used to capture more subs. Once your session is over you can take your flats then leave the camera to take darks.
I don't know if its noise ninja or the ICNR, but your back ground stars are very faint. The image should be sprinkled with golden star.
Otherwise, congrats on getting such long subs. I'm jealous.