Williams air throttles are very touchy when trying trying to control the smoke factor on DD the pedal has to match the control cylinder springs the linkage has to be just right once all the stars are inline they work Eagles are the worst because you have to use a universal controller because there is not enough room on the top of the governor to use the DD controller
That is exactly the problem Doyle has Bruce when he gives it throttle it goes to 100% throttle then comes back down