Is there a reason to grind it up and turn it into pellets? Chickens can eat whole corn just fine, which saves you a lot of bother in feeding them the corn.
When you are comparing with mash, were you feeding it dry? There is often less wastage with wet mash. Some people find it easier to serve wet mash each day than to try to make pellets.
Your ingredients do not make a complete feed. I'm don't know enough to tell what is missing, just that some things are missing (I've read enough feed-making discussions to know that corn and soy can be a good start, if you have the right proportions, but that it needs other things too, and wheat bran will not supply them all.)
About a century ago, it was common to have two-part chicken feeds. One part was whole grains ("scratch") and the other part had an extra-high rate of protein and certain vitamins and minerals ("mash"). If the chickens ate the right balance of the two parts, they got about the same nutrients you would find in a modern complete feed. I imagine the "mash" part could also be made into pellets if you wanted. The advantage of two parts was that the hens could scratch for the whole grains and get exercise, and there was a lot less grinding (and maybe pelleting) to do because those grains were not mixed with everything else. But it only works when the two parts are properly designed to go with each other.
Many of those older recipes require the chickens to be fed large amounts of green plants too (free range, or brought to the chickens in their pen). The plants apparently provided some of the vitamins and minerals that were not readily available as supplements at that time.
Here is a thread with some discussion of historic recipes, from a time before commercial feed was so readily available:
https://www.backyardchickens.com/threads/chicken-feed-recipes-articles-and-systems.1510115/
Here is an article from someone with a somewhat different method of feeding chickens, that has apparently been working for them for several years:
https://www.backyardchickens.com/ar...eat-tears-a-calculator-or-deep-pockets.78655/
And
@U_Stormcrow has a feed calculator: he can run a feed recipe through it and figure out what is missing and/or what it has too much of. He does need to know how much what is in the recipe (measured in pounds or kilograms or some other measure of weight). Also, he's done enough of them that he can usually tell the problems with a simple recipe just by reading it, because he knows what is missing in some of the most common ingredients.