I’m almost embarrassed about my geekosity here Chris, but looking at your astrocartography notes, your sector 243 map and the revised Iron Empires map on the wiki (all of which are super cool), I find that the scale on the last is incorrect. Each of those grid squares should be 200 ly across, yet per scale they are 100 ly across. Looks like the scale needs to be shrunk by 50%, or the numbers need adjusting.
I blame my job. I’m a cartographer in real life and believe me I’ve spent weeks on marginalia.