Having the same problem here. All of my characters are NM, but I haven't had any luck with the Comitatus. I have all of the NM gear, so pieces multiple times over. All of the NM armor (including the chroma gear), weapons, shader, emblems, and ships....except the Comitatus. But I keep trying. A while back and deleted one of my characters and started it over (not to get the ship, just because I wanted something different in that character slot). I am at level 17 NM on that character, still no joy. So I don't think restarting a character somehow increases the likelihood of a drop. I just think the drop rate is insanely low or there is some sort of a glitch.