Dung out the deep litter now or later?

[adele]

I have 7 chooks in a lovely coop with a deep litter floor. As we are at the beginning of autumn here several of the chooks have started their molt and the coop is awash with feathers. As you know with deep litter you don't really clean it out that often but allow it to build up and insulate and it works well. I want to do its big clean out soon but am wondering whether I should go ahead and replace all the litter when they are just starting to molt. will a large amount of feathers affect the properties of the fresh litter during the winter or make it more prone to lice or bugs or anything? should i wait till they are all done molting and then put fresh litter in for them. will it make any difference? Why do they seem to drop all their feathers in the coop and not in the run?