@LeslieMidland Thank you, but as I keep repeating, it wasn't my idea. It's a compilation of lots of ideas, from those who have done it before to those who have added so many good ideas here since my first post. Oh, and Ken is doing much better, thanks. Just has to be very careful with his diet to prevent another episode.
Okay, so I turned Mama Heating Pad down yesterday and went out this morning to find all 11 two weekers and all 4 one weekers active and energetic. I took a little time to pull the straw out from under MHP and replaced it with fresh, since they all roost in there all night long. I think they appreciated it - a few at a time they had to run into the cave and scratch around in the new stuff. I'm not stressed, constantly trying to keep up with dirty waterers, fussing with a heat lamp, (Is it too close? Too far? Is the wall getting too warm?) and cleaning out a gross brooder so the house doesn't start to stink. Everything isn't coated with that insidious dust and we sleep in blessed quiet all night long!
It is absolutely wonderful to watch all of these behaviors taking place. They are so much less like pampered little divas and more like short little chickens out there. I also broke off a chunk of the Bigs' Flock Block and put that and a clump of garden dirt in there for them. They got some grit scattered on the surface of the straw in their run, too. It's cloudy, horribly windy, and much chillier and damper today than it has been, but you'd never know it when you step into their little domain. Never, never ever, will I raise chicks in the house again!