Default [Q] Bluetooth metadata not showing up on stereos. Tried several ROMS.

I have been trying to get my phone to display the song name, artist, and track metadata on several of my stereos and have had zero luck.

I have tried on 3 different car head units (BMW OEM, Sony aftermarket, several others), as well as my portable boombox, and even my expensive Onkyo home theater receiver. I have also tried several different ROMs with the hopes of getting this working, but nothing.

Does anyone have any suggestions on what I can do to get this stupid AVRCP to work like it should?

Thanks in advance!