Sorry I forgot so reply to this thread Matt, I've been looking but kept getting distracted, it's a really nice image mate! I think your original effort is better than the adjusted one by Denis though (sorry Denis
) the amount of star out-of-roundness was not too bad in your original IMO.
I am surprised you had such trouble finding guide stars though there are a few bright stars near NGC 253
There two nice bright candidates right next to the galaxy..?
Mike