I'm having a problem with my quadcopter which I just finished building. I'm using the HobbyKing Control Board v3.0 with the XCopter V4.7 KK by KapteinKuk firmware. I noticed that after setting the throttle end points on each ESC individually and setting the throttle end points via the KK board, I still have one of my motors spooling up sooner than the others. It kicks in at about 20% throttle while the others kick in at about 30% and it's extremely uneven. Before anyone says "stick centering," the V4.7 firmware doesn't have that function :/ I ended up flashing it with the XCopter V2.5 XXcontrol KR by Minsoo Kim and it works almost perfectly. Has anyone else run into this situation?