Main cola got bud rot, so I chopped it off. Hopefully the rest of the plant survives and there's enough to still harvest. Stems are purple-ing and leaves are getting some brown spots, but it's probably close enough to harvest to not worry about that.
There has been a hard freeze almost every night this week, so I convinced my wife to let me temporarily bring the plants and the grow light inside. With a less limited space I was able to raise the grow light to be much higher above the plants, so I also turned the light intensity up from 50% to 100%. Not surprisingly, they seem to love warmer temperatures and lower humidity, and haven't noticed any new pest or mold problems ever since. Whole house smells like weed, so will have to kick the plants back outside in the next couple days.