I had the same issue. My stock 2212-920 were OK, but I was starting to push 2kg and they were struggling.
I changed my motors to the NTM 2836-750kv (not the best but they do the job), moved to 4S. AUW is just under 2.2kg with 500mAh 4S, FPV cam and GoPro with XAircraft Stella Gimbal. Plenty...