Hi RMK,
about the G510, the underside of mine is marked 750W, it's true that I ordered an MD750 but, as you said, I believe that the MD750 and the MD1000 are equipped with the same motor, if you guys check and you have marked 750W it means that either it's a 750W motor with a controller programmed to 1000W or it's still a 750W but equipped with a more powerful controller inside the frame, but Leili confirmed me that the MD750 and the MD1000 have the same torque, so I would go more on the first option.