Barnyard crosses could present any kind of feed-to-meat ratio. If you have no light weight breeds like Leghorns or Polish, then at least you are starting with heavier set birds.
With mixed-DP cockerals, I think you will find nice sized dark meat quarters at 16-20 weeks of age. Breast meat will not be the size you are used to as CornX are bred to make white meat and do it in 6 weeks or slightly more.
To reduce the feed it takes to cover those extra weeks, you could look into alternate supplies of grub, like making a deal with a local restaurant for table scrps or a grocer for produce cast-offs. You may be in a position to glean a neighbor's field after harvest (picking up corn cobs, or apples that the grower cannot use from the ground, etc.) We grow certain items in our garden mainly for the chickens (always more squash/pumpkins than we can eat). Pasturing the birds always helps if you can do it.
Unless you really strike the motherlode, you may still have more money in the feed than the meat is worth, even at your stated prices.
Only you will be able to figure out what will work for you.
There is one poster in the forums who simply goes on Craig's list and asks if any one has roosters they do not want. Many people have to order straight run chicks to get the hens in breeds they want, so they end up with roosters they cannot bear to butcher and eat. For the cost of pickup and time processing, this poster gets many chicken meals.
Just a note on industrial chicken production, around here the corporation provides birds, feed and bedding, and picks them up on the 35th day. The "Grower"/Farmer provides the building, utilities, labor and must dispose of the waste. Typically the waste is spread on fields and used to grow corn, soybeans and other crops. These crops are sold for cash, sometimes to the chicken corporation, but often not. These grower/farmers are my friends and neighbors. They are not "Mean Chicken People" and do the best they can by the birds. I think we should all know that they make so little per bird on these contracts with Chicken Corporations that their kids are often on subsidized lunches at school. The system is not working well for anyone but the corporate shareholders, but frankly in our current economic set up, they are the only ones who matter.
So I do encourage you to vote with your dollar, buying properly raised chicken or raising your own. Just be aware that this might involve some more dollars than you are used to.