My hexa was hoving well in 2.0.33 with default PID except D was doubled to 0.24
But when I tried that configuration I was getting high frequency oscilations on the roll axis. After some trials I went to the default PID and its great!
So to sum up, the default PIDs work well on my hexa in X configuration with AC850KV motors.
I also found that in simple mode my hexa yaw wasn't drifting either.
One request is to be able to tune the camera stablisation PID in the CLI or mission planner rather than having to recompile the code as I try to work out what PIDs need to be to stablisation my camera. I remember it took me quite a few tries in NG code to get the right amount of pitch and roll correction to get the camera to stablise properly.