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I don't have the 2018 HU, but I have an aftermarket Pioneer with AA and a Galaxy S7. With the stock radio and two different Pioneer units, the S7 has been problematic. At this point, I attribute the issues to something on Samsung's end. My Motorola and Sony phones haven't had issue with any of these radios.
Regarding the resolution when using Android auto; If you enable the developer options in AA, there are options to allow higher resolution modes. With my Pioneer radio, AA would default to a lower resolution than the radio supported, resulting in a blurry/washed out look. I'd check that option and see if it improves your AA experience visually.
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