Kamados in general, KK's in particular, are much moister environments than any other type of cooker, so additional sources of moisture aren't needed. Spritzing is ok if you're trying to get a lot of flavor in the bark. A lot of pork rubs have a good bit of brown sugar in them, this gives great bark also. I use yellow mustard on pork of all kinds as a base to help with bark also, but there are those that say it's unnecessary. <br />
<br />
When you try a pork butt, try rubbing it heavily with your rub of choice, cook at a higher temp than 225°, I like 275°, and cook to 205° internal, not one degree less, and see what you think. I'll bet you'll be pleased. Keep it simple at first, then play around. Let the kk do the work. <br />
<br />
<br />
Robert