I have recently bought a 2017 moomba craz surf edition with the 400 Raptor motor. Ungraded Stock ballast which I believe is around 2500-3000lbs. When I have 3-4 people in the boat and have the ballast full, I cannot go faster than 12-13mph while wakeboarding. If I put the ballast at 75% full then I can reach 19-20mph. I'd like to make the wake bigger with the full ballast but then have no speed. Is the motor not powerful enough to carry all the weight? I saw he factory video for the boat on youtube and the wakeboarder said it was full ballast, 3 passengers and 500lbs lead and they cruised at 21mph. Can anyone shed any light on this issue?