How to make Flex Schedules and Weather Intelligence work

The 1-3 minutes was what rachio originaly calculated when I set it up a EU location. Of course I changed it to settings I used on the conventional controller (20-50 minutes).

We I re-configured schedules using a US/CDN location, Rachio calculated times 20-30 minutes. Which looked reasonble to me.

What I don’t understand is the soil moisture level (in zone screen) and the moisture balance (shown in the zone graph screen. Looking to the moisture balance it looks to me if this represents the moisture “level” .
What is the difference between these 2 parameters?

Grtz