Whats up chuck 420, my favorite time of the day,lol.
Anyways, cal.kings dont need humidity, as you said during sheding its good. What I do is just mist my snakes when they are in the blue, other than that I dont have much humidity at all, I keep water bowls with them at all times, for all my snakes except the rosys-(those should have no humidity if you have any rosys). So dont worry about that, some of the other lampropeltis can do well with a light mist here an there, I mist some of my hondos at times, I think they like it, they sit there and love it actually. I also live in the mtns where we have that cool dry air already-(thats why I keep mtn kings, I have the perfect place for them) but your cal.kings should be fine without it. Later,
jeff teel
ps- pictured is a wild caught verbenia locale cal.king female i caught back in spring of 2003, I have a male from there and they should breed in 2005.

Captive Bred Tri-colors