Those videos are a bit strange.. the gumball machine tries to dispense a 4th ball even though it has seen (at least from the 3 geneva & exit switch triggers) 3 balls already get dispensed.
The speed of the yellow part looks faster than I remember mine being too.
Not very useful info, sorry.
Compare your video with this:
Your trough and outhole switches look flaky from what I can see. There isn't a clean movement of balls in the trough, to the outhole, to the autofire.
At 0:31 in your video a ball gets moved to autofire and doesn't even trigger the outhole switch, where it should be sitting.
I wonder whether the gumball doesn't register the 3rd ball going into the machine properly because of this?