I do give additional probiotics, because fermenting adds more pre-biotics, some pre-biotics but more yeast & micronutrients (the good kind) but not all of the bacteria that the gut needs to fight off infection and be healthy.@rnchick74 - like the yolk color of your eggs, I miss the darker yolks. Definitely noticed a difference since I am no longer fermenting. Nice routine you got there, so you add additional probiotics even when you ferment? I ask because my understanding is that fermented feed is full of probiotics and micronutrients. For the micronutrients,I give black strap molasses a couple times a week and kale a few times a week as well. Also the feed we get has kelp, molasses and all the good beneficial bacteria.
Adding an additional few strains of probiotics with it, even irregularly, helps round out the flora in the gut. All the other additional things you are giving help in so many other ways too.
One thing I've learned/read/found was to not put their scratch in their container - but to toss it out on the ground & to make them "scratch" for it. That also has them dig up the bugs & worms in the ground. Yes, you do need to do a good worming at least once (preferable twice) a year and make sure that your soil is good quality (if you garden in it, you are ok). The bugs, grubs, etc that they find in the ground is good for them - foraging is a good thing that so many (mainly urban) chicken keepers have removed from their lives.