Incredibly Fast Rev After Routine Maintenance

Usually the choke on a carb is thermostatically set with a spring that pushes/pulls when hot. When cold it pulls (eg) on a choke cam that wants to set the choke plate but is blocked by the throttle linkage. When you give the throttle 1 push prior to a cold start, the lever that blocks the choke actuator releases and the spring sets the choke
When it's set the fast idle cam swings up and the cam sets a new baseline for the throttle to stop at via that fast idle screw. There is no spring that I'm aware of on the carb itself besides the integrated throttle return spring. The vacuum unloader pot pulls the choke open a tad at full throttle If i remember right. When the bimetallic spring heats up, it loses tension on the choke and gradually releases the choke plate/cam to lower and lower fast idle stops until it completely drops it down to normal idle. It does this automatically but I believe the tension of the fast idle screw on the cam is enough to hang it until you tap the throttle again and then it falls down to it's new state. Sometimes in stages, sometimes in one step depending on how long you warm it up. When it works, it's literally a pump once and turn the key with no other throttle interaction. It'll fire right up due to the very strong vacuum signal the choke plate creates and the slight crack of the throttle that the fast idle hangs up on. Those vids of guys pumping the throttle like its CPR on the motor obviously have a choke issue.