I expect that over time category 5 will grow as you branch out and that the other categories will end up being the smaller ones particularly the two top ones.
In my mind I can kind of imagine where some would probably end up but they may surprise. One has to wonder, where would 420HC, 13C26/14C28 and 12C27 be? Or 1095, (CV and all equivalents) 3V and other carbon steels. Then with some steels you would almost have to have sub categories for hardness. 1095 for example can be 62 RC or 56 RC and perform fine at both or anywhere in between for various purposes. I'm sure each one at various hardnesses would do differently in your testings. Anyway, its some good info. I think you'll find some are surprised at AUS8 being in the same league as S30V but personally I'm not at all surprised. I remember someone saying that when they tested SG2 it only performed like AUS8 as if that was a bad thing. I've always known AUS8 (Note: Real AUS8) was a fine average steel that in many ways is the better choice among the other average steels available including SG2. I've never understood all the negative press AUS8 gets as if its a bad steel. Been saying that for years.
Your tests kind of proves that out.