Okay so I took out my passenger headlight today and discovered a few things and did a few other things.
One, my rear cover gasket was pinched/shrunk in a few places and I'm assuming this is how small amounts of water are getting in.
So I pulled out the gasket and massaged some silicone spray into it to try to give it some new life, then used a dab of gasket maker on the shrunk/pinched part.
I wish I would have thought to put a fan and heat on the headlight to try to evacuate any moisture, but alas I did not do that. The headlight did sit open on the ground for about 20 minutes though so maybe a bit was able to evaporate.
I am going to order new headlight covers ASAP and put brand new ones on both sides.
Anyone know the part number for the headlight covers for adaptive xenon lights? I'm assuming you can't just buy the gasket...