Most of my designs have in fact been with hard chines. I must've tried Carlson Hulls at some point (because the name sounds familiar) but I'm not sure why I never started using it. I'll give it a shot next time I get inspired!
It's got a super weird text format for the input. If you're interested, email me at my user id at gmail and I can give you some jupyter notebooks that parse offset tables in excel to make the .hul file.
