this is exactly right. It is the same problem I have with my king pin as well. If you remove the apron and watch the ball you will see the issue with the elongated hole. the sets screw is a good fix.

I had to put my screw to the front of the hole. Because the hole was elongated to far forward of the kickout. If you let the ball drop in the hole with natural force like it was coming down the playfeild you will see what I mean. put the ball in and make sure it fits correctly. you dont want it too tight or too lose. Also like mentioned by @edednedy, make sure you put something like electrical tape on the head as not to damage the ball. I actually use a rubber grommet. Works perfectly for me.

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The ball kicking out after ball 5 is most likely a miss alignment of your ball count unit. It happened to mine a few times.. Realigning the snowshoes to the contacts was my fix. Also cleaning the shoes and contacts well is important too. If the shoes are just a little bit off, this will happen.