Your motors are fine. The P3 was not made to lift and the flight characteristics will dramatically change when adding any weight, especially if it is not well balanced.
Well, I appreciate everyone hijacking my thread that was supposed to be about why is my P3 struggling with the weight of the Lume Cubes.
Back on topic, could my motors need to be replaced? how many hours do motors last? Maybe I'll take a short video and show you guys.