Bad news:
The usb filter doesn't provide enough bandwith for smooth operation.
For example If if music is playing though spotify, and I'm browsing through albums the audio and video start to stutter, same thing happens if watching a video. Music on its own or video on its own is fine...
Next step will be to ditch the filter, and connect the 12 to 5V converter straight to the Carplay dongle...
Pic below shows what i mean:
