Depending on the size of their range and the quality of forage, I would expect good supplementation this time of year in Florida.They also free range 4-5 hrs a day.
I usually bump up nutrition a couple weeks before I start collecting eggs for incubating.
Layer feed is adequate nutrition for production of eating eggs but not necessarily to nurture an embryo to maturity and the strength to escape from the egg.
I don't think that is your problem though. Your eggs aren't fertile to begin with.
Your rooster is in a good age range for high fertility. You may need a new unrelated rooster. For the time being, I'd add a couple hours of light on him to see if you find halos on the yolks.
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