Define flip out of control?
Make sure you set min_throttle high enough. I calibrate 1000-2000, then set min_throttle about 40 points higher than the minimum throttle that gets all the motors turning. So around 1050 to 1070 typically.
Doing that ensures that the props are spinning fast enough, even at zero throttle (stick) so that the props don't stop or windmill backwards, this ensures Airmode can maintain attitude authority.
And set the max_throttle to a bit less than 2000. Not sure how Kiss works. But you don't want the FC to run into deadband at the top. If that happens, lets say the motors max out at 1980... The FC needs more power and goes to 1990, but nothing happens, P error increases, FC asks for more and more power until it goes to max, still nothing changes. The FC then needs to kill power on the opposite motor... All of that took time and if it takes too much time you can lose control. Try 1960 to 1980... You can emprirically determine this by listening to the motors when you spin them up with the motor test... Find the last step where the RPMs stop increasing. This can be a bit tricky unless you have a way of limiting current, because spinning at full throttle with no props is not a good idea.
Those two are the biggest source of problems for people.