My AUW on my F550 Heavy lift conversion is 4042 Grams. That is including the Droidworx Landing gear, AV130 Gimbal, Canon T2I, Axi 2814/22 motors, the conversion kit, and a 4S 8000mAh lipo.
The copter flys pretty dang smooth with gains set 70-80. Flight time fully loaded is around 6:30.