I have been using the deep litter method , I use stall dry and
some lime tossed onto the wood shavings with the addition of fresh shavings
when its need I have no odor and I only totaly clean out my coops in Sept. and April.
adding the extra shavings and Stall dry, when needed
I feel is the key to keep the odor down..and of course the lime
but I also have a 1 inch vent all around the roof line.
and the pop door is opened all day for then to
get to their run. And I rid my self of dropping boards and substituted
my empty feed bags flatned out,
as they get soiled I just sliped out , and add the clean feed bag.
( shake into the compost and toss the bag.)
its really a time saver. for me.
Adding a little stall dry to the litter makes such a huge impact on how they smell, it also sucks up moisture and keeps the bedding drier. Best of luck.
I might be crazy, but I go out and scoop the poop on the top of the bedding with a cat litter scoop once a week. I get what I can out and mix up the straw and do a big clean in spring and late fall. It seems like you should have enough ventilation. I also use a 60 watt light bulb during the day and that helps dry the coop up and keep it less smelly. I have 2 coops and the one with the bantams seems to keep dry, but the std chickens seem to create more moisture and the bulb really helps dry it out for them.