Wow man that sucks! It sounds like an ingress problem, the crappy thing is you have done most of the trouble shooting for an ingress problem and it has not gone away.
The only thing I can think of is if it is picking up Alternator whine, then maybe look at your splice point?!? Maybe try...
From what I knew Android Auto is not going away. But being able to run it phone only is going away. So there will no longer be an icon that you can launch Android Auto and see it on you phone screen. You will have to plug it into Android Auto certified car stereo, which SYNC 3 and 4 are.
You will only get Homelink with the Tech Package, so no it will not have it. It will just have a standard auto-dimming rearview mirror. I was thinking about doing this upgrade when I get my Outer Banks. COuld be a easy and nice addition.
How do you like the JBL's? They are a little cheaper than the Pioneers I have been looking at. Do you think they provide a good over all full sound? I already have a Kicker Amp and Sub, I'm just looking for an option to replace the stock door's...
Thanks man!