I had 15% all the way around(except windshield of course) and I got a tint warning. I replaced the front with 35% and haven't had problems since. The 15% up front was a pain in the ass to see out at night IMO.
I bought a set of 5mm spacers off of a fellow member to put on my RacingHarts and there's not enough lug sticking through to get a lug nut threaded on.