sounds more like tire clearance is tight and your getting some flex or something on G-outs that's causing tire rub. esp if you have a Maxxle, DT Swiss, or similar QR skewer, you might also want to check it hasn't loosened itself.
re: eye pro
fwiw, at AF, I ran clear lenses on my goggles and had no issues with things being too bright, and itnwas full sun most of the time. I refuse to spend pri$m money on mtb eyewear. gets scratch or trashed too easy. on days with even partial sun, I wear full shades. on cloudy or rainy days, I go orange or clear. I could go on a rant about the extinction of 'value' gear, but I won't.
as usual, don't over-think it. go lighter on the shade if you're concerned about heavy sky coverage. with a visor helmet, it won't be a problem in areas of full sun. if you're that concerned with your pupils, you're not focusing on what really matters: the exit of the turn, body position, HAVING FUN, etc.