This is a pretty old thread indeed but still, I don't think Silkies can beat Gamefowl. And, my Araucanas are pretty hard to beat too. The main reason people think Silklies are hard to beat is because they're one of the few breeds offered by hatcheries/feedstores (most of where people get their chickens) that haven't had broodiness bred out.
The secret is non-hatchery stock.
You'll see seriously broody hens of many breeds that are equally as consistent as most Silkies.
My Sussex from Greenfire imports for example give me about 6-8 eggs before going broody. Again. I just found one of my hens randomly broody out in the middle of the pasture on 8 eggs, this just before I broke her from broodiness a couple weeks ago. (
which I got 6 eggs from her before that) I took her off the next, separated her into a little pen for a week, then let her back out to the pasture again. She was around for about a week or two, then gone again. Probably broody in some random hidden place out there. Again.
Forgot to mention - My Sussex are the biggest chickens I've ever met, so they fit a lot of eggs under all that meat and fluff too, and past the actual incubating, they're darn good moms.
I had a broody hen who I removed from a nest once and introduced her to another hen who was taking care of one chick. . . . The Sussex took over and "stole" the chick. She ended up being a better mommy, - And she's never met a chick nor seen an egg hatch before
The biggest surprise was that the hen she stole the chick from was a Shamo. Takes true guts and bravery to steal from a Shamo hen.