I would leave it be and let it drain a little and then throw some BOSS in there and let the chickens toss that top layer for you~~after that you could add a light layer of dryer stuff on top. There should be some naturally occurring and beneficial molds happening in the deeper layers anyway and these all help in breaking down the materials in the composting process. The worms and bugs rising to the nutrient rich moisture will also aerate these bottom layers somewhat.