High performance flight stability with px4-sitl jmavsim by running autopilot faster than 250 Hz

I am using buildMulticopter with a thrust of 20.0 and setDragMove of 0.0. this allows me to fly at 50 m/s/s. I can’t get stability a a thrust of 24. I believe if I can speed up the autopilot clock beyond 250 Hz I will be able to go faster. Does anyone have any advise on what I can do to go faster. I have the need for speed.