I'd love to know what rules you've been using if you have the time to share. Cheers!
Sure - there are a few tabletop AI systems that work decently well, Rangers of Shadow Deep is one. The Lone Warriors supplement for Brutal Quest by Mammoth Miniatures is another. And Of Knights and Quests by Kazdok has another option for solo skirmish games. I'm happy to discuss optimal homebrew solo rules too.