Your comment didn't go unnoticed! Just doing a bit of research on the subject, and while YES, AA and ACP do have different volumes based on the task at hand, the problem most certainly lies in the module not being compatible rather than there being a software issue.
I ran some tests to check out the fixes in THIS THREAD that I found when I Googled the issue you suggested.
Unfortunately none of them worked. Furthermore, to be more convinced it's the module and not the device, I can unplug my phone and plug it directly into another car that has AA and everything runs and plays fine, I'll unplug it and put it into my truck, and nothing. I tried adjusting the volume knob during a song, using the steering wheel paddle volume controls, Spotify volume controls, android volume. Nothing.
Looks like we need to hold out for the radio module programming.