I didn't know much yesterday when I was writing, but I came across this post from @kotonoke in the Discord of 1UP https://peakd.com/hive-131619/@kotenoke/thetan-arena-2nd-entry-chance.
Here he does some calculations and stuff, and the math to calculate is there, you just have to change the value of THC.
Hope I helped there, and thanks for coming here.