maybe make a smaller scaled down system, 3" net pot in say, 1/2 to 1 gallon , plastic containers, (a sort of tiny GH Water Farm system), veg them until you see sex, then plop the 3’s into a larger net, or into your 5 g buckets.
Your not using medium, but if you did, all I did was to rinse the root mass in a bucket of water, just sort of giggling it about some, then add them to the lava rock medium I was using at the time.