I just discovered a way to hack the DJI drones and it works flawlessly.
See this youtube video from flyflydrones describing step by step how to modify your drone.
I have personally tested this on both Spark and Mavic and the result is amazing.
By using these settings you will gain a speed of 82Km “Mavic” and the vertical velocity is just so incredible fast. About 10m/s… !!!
There is also a FCC hack and Boost hack available to gain more transmitting watt`s.