I’m not sure the exact percentages, I’ll have to ask, I was hoping to get some answers before contacting the person lol but my chickens do always have access to oyster shell for calcium and they are mostly free run
You can't begin to assess the nutritional quality of a feed without knowing the ratios of inclusion. After that, we can guess based on published "Averages" for various ingredients, in the knowledge that there are no guarantees whatsoever that the ingredients will meet those averages.
Big difference between soft wheat and hard (red) winter wheat as well.
The general recommend is that peas shouldn't exceed 10% of the mix, there are some potentially concerning anti-nutritive properties, but they are a common plant-based way to drive up protein numbers.
Barley is high in beta glucans and potentially high in tannins, both to be avoided in significant quantitry. Beta glucans slow digestion (good in humans, not so much in poultry) and contribute to sticky poops, tannins and beta glucans can both inhibit (different) nutrient absorption. That doesn't make barley bad (or any other ingredient, used responsibly) - tannins (also peas) , beta glucans, lignins, lectins (peas), trypsin inhibitors (peas again) are all unavoidable components of food stuffs - its an excess of them that becomes concerning. You wouldn't drink a glass of metamucil every meal (beta glucans and lectins, i believe), or suck on a tea bag between bites (tannins) - neither should your birds.
Even if you can hit some protein % target, I'd be stunned if you end up with a good amino acid profile. Peas are a decent source of Lysine and Threonine, pound per pound better than grains (wheat, barley), but a poor source of Methionine and only an adequate source Tryptophan. Wheat and Barley, pound per pound, due to their low overall protein numbers, are poor sources of Lysine, Threonine, Tryptophan and very poor source of Methionine. Peas (in quantities recommended against for other reasons) can easily compensate for the the first two, but your Met level is going to be low no matter how those ingredients are proportioned - and its the first limiting amino acid.
I would... Recommend against.
/edit and did you mean the higher protein mix is $0.30/lb or an additional $0.30/lb??? I freely admit, I get unusually good mill prices from my local store, but my last purchase (05/30/22) was $0.251/lb for 16% protein "layer" feed with the typical 3.5% calcium +/-) and $0.322/lb for a 24% protein Game Bird Grower with a much more reasonable (for my mixed flock and hatchlings) 1.2% calcium +/-. Both feeds have very good amino acid profiles (the published portion anyways, and based on the ingredients, the others should be in the desired range). I buy 500# of feed a month during the growing season for all my animals, for comparison - the chickens and ducks get about 2/3 of that.