Always happy to help. I'll support you guys until Al Gore decides to shut down the internet. 
Happy to test anything you'd like. I've sent you a PM. It's interesting that you are not experiencing the issues on your devices. Frustrating that must be.
I agree that it is difficult working with all the different versions of android. Google themselves have addressed that. One of the reasons I don't develope anything for android outside of my own personal apps.
I've noticed that in a 3 minute live game about 70% of the time the game will hang when a total elapsed time of between 3:30 seconds and 4:15 seconds has elapsed. As mentioned previously entering chat and then exiting will usually resolve this. Perhaps querying the server on a more frequent interval would resolve it? You must have some kind of latency compensation on hand to be able to resolve the clock like you do.
Again, eager to help.
Moto X Android Kit Kat.
The good:
I like the way the game looks. I like that more of the sites features are accessible from the android app.
The bad:
Thank you for detailed feedback! As a developer you are probably aware of testing environment. And i can say that we do all possible tests on our side, and all your mentioned cases are works fine for us, and not depend on wifi/3G/4G/2.5G/2G, signal strength and etc. We do have a some devices, some different cellular networks to test with, but we can't cover all possible differences. What we can do, together with you is to test a special version, which you can receive by email(please send me a private message with email), and we collect that data and investigate your particular case.
Immersive mode is 4 months new feature, and we have a more important things to fix rather than implementing new shiny features, that doesn't make better performance and doesn't work on all device with a simple code snippet.
Thanks again for detailed feedback!