I would like to share my current parameter for DJI F450 and Gaui 500X

DJI F450
– 4 x DJI Motor 920KV
– 4 x DJI ESC 30A Opto (no BEC)
– DJI Props 10×4.5
– Frame length 450mm

Pitch: 120 / Roll: 120 / Yaw: 135 / Vertical: 120
Atti Roll: 85  / Atti Pitch: 85

Gaui 500X
– 4 x Scorpion 1050KV
– 4 x Gaui 10A ESC (Turnigy Plush 10A)
– Gaui Props 8×4.5
– Frame length 500mm

Pitch: 135 / Roll: 135 / Yaw: 135 / Vertical: 150
Atti Roll: 140  / Atti Pitch: 140

Both fly good with this setting. But when DJI F450 use with Gimbal camera stand need to adjust Row gain a bit.