I do the same. The sound quality from a streaming source is far better than satellite radio.
Without making this too long...
No. The source is the device, not the Jeep, so it defaults to FM because bluetooth takes a couple seconds to link to your device.
When you stream from your device to the radio, once the radio and device connect, you do not have volume control on the streamed channel for a couple seconds. A pop up will show on your touch screen that says "Remote Allow" and that's when the volume is linked between the 2 devices.
Your device and the radio volume work in tandem, and the radio volume control is more sensitive.
Make sense?