1. If you install the USB as instructed, they become charge only. You would need to use the data USB instead.
2. First, set your radio volume to 20 in the vehicle settings area and then set the bass and treble to something that sounds decent or okay. From there, you can use the EQ to tweak it. Try the presets and go from there.
3. Have you removed the factory screen protector. The screen looks like crap with it on. I bet your camera will look better too.
4. Try BT only. I am not sure as I haven't tried using it for phone calls.