During the early stages, when I think of it, I give the carboys a 'twist'. Helps to get all that gunk off the sides and down to the bottom, where it seems just a tad easier to deal with.
I shoot the headspace with argon just as I put the airlock in. I will top up a little more and remove the oak at the next racking. I always hit the space with argon if the airlock is removed.