Read about StarFixer AI software on the excellent 'Professor Morison's Astronomy Digest' so gave it ago on this widefield data in which many of the stars were very poor. It did make a significant improvement and probably works a lot better on good data with better stars to start with. Will certainly use this software again. I do like Virgo - so much going on! Stack of subs taken with my Canon 600d DSLR, on a Star Adventurer EQ mount, at ISO800 and f=35mm.