Still didn't try unstable FasterN9, but I think I have found interesting "undocumented feature"...

Before PR 1.3 my idle power consumption was around 5-8 mA. After updating to PR 1.3 it jumped to ~13 mA. I double-checked configured daemons, processes on the top of htop - everything seemed fine. So I gave up and accepted new increased idle power consumption as necessary evil of using PR 1.3.

As I mentioned earlier in my posts, when FasterN9 was installed on my N9, idle power consumption was even higher than right after updating to PR 1.3: ~17 mA. And now... after uninstalling FasterN9... my idle power consumption, miraculously, returned to it's pre-PR 1.3 value of 5-8 mA!