@far-blue No problem. I made research and found interesting solution
All is here:
https://youtu.be/a_LR1oula_0?si=WlHVB7TmKjmmyJZm
I found proper link to calculators described in movie (web page has changed):
https://www.8020endurance.com/80-20-zone-calculator/
Today after running test with 3 and 9 minutes intervals I had all data and adjusted all. Should be OK.