Tested with the other n7 I have . Installed and rebooted as supposed to do.
Unfortunately didn't resolve the issues of bt headset sound shuttering because... It can't! Seems I'm not the only one with this issue and not only with a nexus 7 2012 playing real racing 3.
To confirm this I've installed asphalt 8, another high demanding game and the audio is just fine.
The script did endeed something. On my 6.0.1 rom aosp based the system seems a bit more responsive and the multitasking is better. Please consider I'm on f2fs for data and cache, trimmed every day.