I recently picked up a Valve Index. I followed the settings from CptLucky8’s thread and in Steam VR settings I’ve turned brightness from the default of 130% down to 100% which is mostly ok so far, though at mid-day a bright snow-covered mountain in the distance blends a bit into the bright horizon.
For airport markings I’m mostly following the yellow taxi center line, green/blue taxi center/edge lights, and the runway markings for lining up. These seem decent to me with CptLucky8’s settings; at the initial defaults the texture filtering was really bad, making it hard to see upcoming changes in the taxi line, but I’ve found it improved with those settings in place.
I’m not really paying attention to the taxiway signs because a) it’s hard to read anything small, b) they don’t appear at all at moderate distance, and c) i’m using the taxi chart in Navigraph as my primary reference for where I am.