Hey, glad to hear that your using the cargo ships! Im not taking freelance jobs at the moment but would love to hear your thoughts for future assets when I get the time.
I designed the first two rows in the pack to be the smaller, more angular, combat ships. I'm curious to hear why they wouldn't work in your situation so I might be able to improve in the future. Sorry I don't have a good option for capital ships at this time.
If you need just a few combat ships, my Blue, Green, and Red spacecraft asset package is a popular option (and free!)