The electric choke mechanism has less mass--and therefore cools down faster than a system that depends on intake manifold temperature such as a divorced-choke coil, or even a hot-air choke.
Even so, you should be able to kick from the highest step of the fast-idle cam to the second-highest step INSTANTLY upon starting the engine; and the second-highest step shouldn't have the idle speed so fast as to cause any sort of discomfort.
My guess is that you don't have the choke pulloff/vacuum break, the choke-blade position, and the fast idle cam position properly synchronized. With the choke COIL still trying to close the choke, the pulloff/vacuum break should pop the choke blade open far enough that the engine doesn't gargle on gasoline, and with the choke blade forced open by the pulloff/vacuum break--the fast idle cam should rotate to the second-highest step as soon as you touch the gas pedal enough to release pressure on the fast-idle cam. Point being, it's a three-way relationship between pulloff/choke blade/fast idle cam; with the choke coil position and the fast idle screw adjustment making things just a little more complex.
https://www.chevelles.com/threads/ad...roach.1131913/