I have free fed for 21 years. While this does not make it the best way & I have no doubt some chickens may get fat, I have never seen it affect my hens health or production so I am sticking with it. Just another example of why if this board had been available 21 years ago, I would not still be keeping chickens. It is wonderful that so many take such good care of their chickens, but I would go crazy if I had to worry about all the minute details of chicken keeping I read on this board.
I agree, sometimes people make keeping chickens seem so darn HARD!
OP, are your chickens fat? Don't think they might be based on what you're reading here,
go and check! Feel their keelbones. Are they sticking out and prominent (skinny chicken) or does the breast mound up on either side with the keel bone in a valley (fat chickens). Or, does the keelbone stick out a bit but not too far (just right)? You simply CAN'T make a determination on whether or not YOUR chickens are eating too much by reading a thread on the internet.
If your birds are skinny and you're still going through lots of feed, something else is eating the feed. Period. For us, it's wild birds. Even though our coop is predator proof for the most part, the wild birds come in through the chicken pop-door for a meal. We lose quite a bit of feed per month to wild birds. I know it seems like wild birds can't eat THAT much, but my dad was a dairy farmer (so yes, his feed bunks were on a huge scale compared to a backyard chicken feeder) and he calculated he was losing $20,000 worth of feed per year to wild birds. I know I lose more than 10lbs of feed per month to wild birds.
If your birds are too fat, then you can try using a mash (rather than a crumble). You need to add water to a mash, otherwise it's too dusty. But if you add water, the birds will get fewer calories per bit. You don't have to ferment it, though you can. The research I read found that using a wet mash was almost as good as using fermented feed. Do realize, however, that most of the FF research has been for meat chickens and increasing weight gain, so your mileage may vary. You can also put them on a feeding schedule and feed 1/3 lb of feed per day per chicken, then watch their weight closely. I would NOT use only 1/4 lb of feed per day unless you have cage-bound white Leghorns or Leghorn hybrids, like Amberlinks or Tetra Tints. Pretty much any other chicken needs more food than 1/4 lb per day.
If you go from free-choice feed to feeding once/twice per day, you can expect them to stop laying for a bit. It's common for laying hens to quit laying for a day or more if they run out of feed, and if you go from free-choice to once/twice per day it will seem like "running out of feed" to them for a week or so until they get used to it.
All that being said, I feed free choice and always have. I never have fat chickens; in fact, my biggest problem is skinny chickens and I'm always trying to come up with ways to get them to eat more! I increase bunk space, take pans of feed out to the pasture so they don't have to go back to the hen house, etc. Again, I know my birds can get too skinny because I CHECK. Once you go check, you'll have a much better idea of what questions to ask/actions to take.