Greetings from Bulgaria.I make own drone.
I'm interested in what should be approximately gain to be able to make a safe first flight - Basic and Att
All parameters ( C.G. ) are correct and put in DJI assistant v1.9.
If anyone knows, and did similar drone can share personal experiences

Controller - A2 and GPS PRO+
IMU - mounted in the center under battery
Motor - 8 X DJI 1200PRO
Diagonal axis base between engines - 1245 mm.
Diagonal base with pitched blades - 1680 mm.
Angle Arms - 5 degrees and 1.8 degrees inclination
Battery - TATTU 30000 mAh / 25C
Total flight weight - 11180 gr.

Congrats,,,

Why not download the A2 Assistant software to start from the default settings? Make sure that you have any firmware up to date.

I achieved these results when using a zoom camera !