I am also curius about that since I experienced similar issues.
Regarding number 4: Please check if the next command (here: fan speed) is executed when a specific temp of the nozzle is reached.
Here’s why: I have noticed that my nozzle also heats up, and the next command is executed when the nozzle cools down to 60°C.
So please check if your “120 seconds wait time” are just coincidence. The real trigger could be nozzle=60°C.
This doesnt solve the problem entirely but maybe will lead to a better understanding of the root cause and therefore fix.