I'm blowing the motor. Currently the trans shifts early at WOT which is fine because this is a road race car that I shift manually anyway and early shift points when I'm dawdling around the pits and on warm down laps are fine.
Oil pressure is adjusted up so it punches through gear changes nicely when manually shifted.
At WOT your shift points will not change. You can change governor oil pressure by changing the springs inside the governor wieghts or by changing the wieghts themselves. Lighter springs and or wieghts will make a later shift. I assume you are saying that there will be pressure instead of vaccum. I'm blowing the motor.