a topic alot of groms/kooks have trouble with so ill give u my hints
pack largest to smallest length wise starting from the bottom, layering with towels/stretch covers. bubble wrap is a saving grace here, cheap and effective. pack it in around the nose for your life. if possible, FCS sort fins should be taken out and packed seperately. around the outside of the boards stuff everything in, wetties, boardies towels etc. should have a scratch/dent free quiver for your trip.
my personal choice: Balin stretch covers in a FCS travel case if possible