To Much Cam?

Sounds to me like your thinking a torque converter works like dumping the clutch in a 4 speed?
A converter works at moving the car all the time, but with a higher stall speed it feels like it's slipping ,just like when your driving a standard and you slip the clutch by holding it half way in.

Even with it not being locked yet it will move the car and spin the tires.
Think of a tow truck pulling someone out of a ditch?
The tow truck driver will slip the clutch and give it gas ,pulling the car out of the ditch.
The max stall speed is hit when the tires don't spin and they hook loading the converter to max stall speed.
This happens when you mash the gas when you go to take off from idle and your using a set of slicks.