The digital speed settings were key (overriding the default values of "10"). Your settings may vary.

The digital speed settings should not affect analog controls like trackpads.

There is no sensitivity for all games, each needs to be set according to the encoder wheel used in each machine.

Information here on finding the sensitivity value needed for each game:

https://web.archive.org/web/20160421175734/http://wiki.arcadecontrols.com/wiki/Spinner_Turn_Count