Re: Soaking for no reason?
It could still be mites. I had a similar thing happen with my boa - she was soaking, but everything was fine, so I thought she just liked to bathe because I didn't find any mites anywhere. Then, about a month later they're everywhere.
It takes the eggs about a month to hatch, and the eggs are laid under the snakes scales, so they're therefore very hard to spot. My advice is to maybe do a couple mite treatments as preventative medecine and see if he stops soaking, and make sure husbandry is up to par (I don't know a lot about cal king husbandry though, so I can't help you there :P)