So, It's been crazy busy around here for the last week or so. We got about 3 inches of snow, which is really rare here, and it stayed on the ground for a couple of days. The chickens did not go out foraging in it. I had to supplement feed until the snow started melting.
Egg production is still good. I'm getting at least a dozen a day. Shells are thick, membrane is thick, and yolks continue to be very dark orange. There is a noticeable lightening of yolk color for a day or two after supplementing with feed. They seem to have chosen 3 primary egg laying spots and are returning to them daily, even when I remove all of the eggs. I am not finding eggs in the wooded areas lately.
We culled 7 of the 9 roosters yesterday. They were not meaty birds, that's for sure.

Visually, the carcasses were on par or slightly under the weight of average dual purpose breeds. One went into the pressure cooker right away and turned out some really great bone broth. I honestly feel like they wouldn't be worth the effort to process if you are interested in meat only. They may have been a little meatier if it hadn't been winter time.
So, update in a nutshell:
-feed is supplemented with 2 or more days of rain/snow,
-egg production isn't affected, yolk color IS affected with 2 or more days of rain/snow,
-chickens don't like to walk in snow,
-chickens don't like to forage in snow or heavy rain,
-8 month(ish) old forage roosters are almost equal to dual-purpose breed weights.