Yeap, your maths are indeed correct (of course)
I was refering to the 20.62 units setup (main hp setup, first one in the list of swolle).
What I generally use it's actualy a simpler calcul: 4 units is a good art. From there I can calculate the difference between several config. I am actually happy to see that we almost all have config around 20 units (5 times this 4 value unit), which confirmed my assumption.
So, as you have 1 unit less, it's like saying swolle is playing with 5.25 arts. With his 23 unit setting, it's almost a difference of 4 units, so 1 art: swolle is playing with almost one extra arts on (6 instead of 5 - op guy :p)
I would be curious to see baba config to compare
It's a quite simple comparison, but always fun to see :p We should organise some competition where players can only use 15 units (with +/- 0.2), just to see how it goes (and how people are good when using the same setup) - we of course need this with no flux (beginning of the month), and at same level (although we could also compensate the level by adding more arts units).