Gosh, I am so sorry! I don’t see anything wrong with your setup as explained here. You have put so much thought into it. Where did you get your birds?
I don’t like the Omlet coop, I think it is too small and also doesn’t have good air circulation - that is the only issue I can find you might...
I am sure lines can vary… mine were from Meyers and very active, loud and feisty, and I have read that from other chicken keepers, too. Glad yours are so nice! Definitely wouldn’t get Leghorn for a small backyard flock. They have been bred to lay above all else and are, like you said, flighty.
I forgot one thing: did you get yours as chicks? Brooder mates tend to get along better since they don’t know anything different. Also if you get chicks, use a heat plate, a ceramic (not light emitting) heat bulb or a nice dark red heat lamp. Having a white, bright light on chicks in the brooder...
The Welsumers are a bit more reserved than others, but they caused no problems. One of my two was definitely the head hen back in the day… Now I still have the other one left - she is eight years old this spring. When I gave my roo away last year, she started crowing. So they definitely are...
A bit late to the party, but just in case you are still up for input:
Get chicks ( from a hatchery, immunized for Marek‘s) - they are so cute, fun to raise and you don’t risk getting birds that are already harboring some illness. They will also be easier to handle than chicks raised with less...
That is unusual. I wonder what else might have been going on. I started out with a flock of 15, coop 60 sqft, run 80 sqft. They free ranged some, not a lot because the guard dog was still in training. Then we burned down and the chickens had to get evacuated to a friends farm for a couple of...