Everything you have mentioned has been reported numerous times. This thread has a ton of information in it.
This bluetooth issue is none existent with me. I mean at first yes it sounded a little flat but I went into the built in equalizer in googles music player turned bass up and boom got good sound quality back. The real issue is it not playing through the headset right away. But there's work arounds for that like doing the phone call thing or simply killing the task and starting it back up. But as Task said all has been reported. Again this is the best ROM experience I've had in years #1 in my book!
Sent from my SGH-I747 using xda premium