Welcome, I joined this forum 2 years ago and my advice would be to read, read, and re-read. There is so much good info on this site. I found other members to be more than willing to help in threads or via pm.
You bought black because it's the only color that gives the best reflections and looks the best when polished and clean. Never have regrets in life. Your Audi looks great man. Black is also the only color that shows how much you take care of your car also.
I never understood putting a badge on a car that doesn't belong there. I see it all the time type R, M3, AMG..... and so on. That exhaust is the most hideous thing I have seen on a vette.
Never used the KAIO but the paint on my Honda SI chips down to the metal from rocks. On my last SI, when the paint chipped I would at least see primer.