You could try a spray in conditioner I have used them when I go away on our boat as it is more difficult to groom regular plus they get allsorts in their coats helps reduce the knotting.
I do at the moment quite like "The Stuff" leave in spray conditioner I use in on dry coats as well as wet non sticky helps no end with Jodie who has a fluffy coat even tho she is 2 still like a puppy.