my suggestion would be to either ferment or soak them or even sprout them. Even just 3 days of sprouting will make a big difference. and it is easy to do.
I sprout some grains for my pigs and it only takes 2 mason jars and small trays i made from plastic salad containers. So it does not need to take up a big space or need to sprout for 7 days....
check out this pep badge for sprouting feed for chickens
Grow sprouts for chickens
since the broilers are not going to be raised forever. i imagine they will do completely fine on sprouted grain and forage from the chicken tractor. We started our current layers on whole soaked grain at around 3 weeks. once they feathered out. One thing soaking does is it provides the food and water at the same time so they will need to drink less water. not much but less. What we fed ours was called chicken scratch, it had wheat/barley/lentil. no soy.
Its real helpful if you move the chicken tractor everyday. I am sure you know this however.
sounds like some yummy chicken mmmmmm