11mini: I personally don't do ff but I never really had a problem with the smell from my cx on pasture because I move them so often. I am very sensitive to smells. The brooder is a different story and even adding shavings twice daily still bothers me once they get into the second week of age. I usually move them out to pasture before they reach 3 weeks old because of that. I never smell my layers and do pine shaving deep litter method on them.
How ever many cx you decide to do, you will learn quickly whether or not it is the right amount for the area you have. They grow so fast that they make their presence known very quickly. I do worry that if the smell from your layers bothered you that cx may knock you over.
FF may solve that but I haven't tried it. Mostly because I am actually quite happy with the results that I have gotten with the dry feed and my cx surround me so much that I don't think I could deal with a bucket and ladle without being mauled to death.