Definitely update to latest stable release, AC 4.0.5 (at this time)
I’m not impressed by the almost complete lack of details in the manual (1 page) or any diagrams. I think those Flame ESCs have two lots of wires to servo connectors.
The one with three wires is for programming, and the one you want with two wires is the PWM input.
Search and read through the posts about large props, like 28inch and similar - I assume you’re using big props of you have 200A ESCs. Gather all the knowledge you can…
You will need these settings, and don’t worry about trying to calibrate the ESCs even though the manual says to do so.
ATC_INPUT_TC,0.2 <- optional