You could add uniform hull length and type to "load height".
I did a good bit of testing when setting up a new MEC with anything that changed the hull, powder charge volume, shot volume or wad.
It never occurred to me that someone would want to use a mixed bag of different hulls. Everytime you change hulls you might need to tinker with the crimp.
Back then I was focused on shooting as cheap as possible so I used lighter than normal skeet loads.
My employer back then bought a new set of Thomas Register every year. Those large format books had .100 thick cardboard covers.
I cut all the covers off and took them into the factory during lunch break. There I used a Strippet Super 30 -30 punch press to punch paper discs out of the book covers. After several days of lunch breaks i would have a gallon or so of the paper plugs in a plastic bag.
All I had to do was toss one of the paper plugs into the shot cup of each shell to drop the load by 1/8oz of shot. The plugs looked like old Alcan over powder wads from the Jurassic epoch. They permitted me to make slight adjustments to the load without making adjustments to my preferred crimp settings.
I only used 4 different hulls in 12ga and 3 in 20 gauge over about 20 years. I used WW AA hulls in both guns a lot. My skeet range burned many of the lesser hulls. I got the RP compression formed DOVE & QUAIL hulls for nearly nothing. I got the Reifenhauser type Federal hulls for carrying them off. I was able to load the same load in multiple hulls in each gauge even though the internal capacity and case lengths were different.