AppDaemon missing events?

I've been trying to use AppDaemon with HeatIt Z-Push switches to control lights, audio volume, temperature, what have you. For just clicking, this works great. Using the things as dimmers though, I lose about 20% of KeyReleased events, so brightness/volume/temperature just keeps (in|de)creasing.

Is this a known issue? Am I doing something wrong? Should I try NetDaemon instead (I'm a professional C# dev, Python is just a hobby)? Should I just give up and use old-style light switches, like some medieval peasant? Am I perhaps holding up an event loop that causes it to miss events? Hepl?