@Hyph_K31:
I wouldn't worry about it too much, tbh. My experience with the Glaug's Catcher (which has a very similar plan-form) was pretty positive. There is simply no avoiding needing the center to be offset, with a ship like that, if you want it to feel natural when it turns, and that means a bigger collision circle than normal, and that means some whackiness with the AI.
The primary problem there is with shields, not hit detection per se, except from the rear, where it won't matter as much as you'd think. Bear in mind that weapons' ranges are not how far they actually go- shots are still active while fading out, which means that the AI can fire at the collision circle and still get a hit quite often. It'll have issues with beams, but that can't really be avoided (at least, not cheaply; in theory, weapons could check vs. the bounds area before deciding to fire, but that's quite expensive, unfortunately).
Lastly, it all depends on scale; a huge ship with a non-square profile is going to cause some AI problems, because there will be areas of the collision circle that are empty and that are quite large, which is why the AI has some minor issues with the Conquest. That said, it's just not worth worrying about, if the ship's smaller than that in all dimensions. Your ship's plan-form is close enough to a circle that very few obvious issues will be seen, and nobody really cares about the things that just look like misjudgement of range on the AI's part.