Can only comment with regards to my own procedure & use of a CSG.
Cheese, limit the size of each portion & turn periodically for better "cosmetics" & even smoke penetration, prior to resting & wrapping for maturation thereafter.
You got lucky (kind of) with the moisture, for your Him/rock salt, based on what we discussed on another thread in this section, a bit of moisture will help draw & lock in the crystalline salt form, however its a very slow uptake for this type of salt (not my knowledge, as regaled by a member (rod as I recall), worth reading.
Maldon salt take it far easier by comparison, (again on a thread).
moisture was possibly reaction between cold metal & the marginal increase of your cold smoker, worth getting accustomed to, did it trickle or was merely present within the chamber, there may be a slight smoke coloured moisture formation over your cheese, but I don't worry about that, it disappears as you turn it, & i've typically found it on softer cheeses such as brie when chucking them full smoke for 3 x sessions.
I'm an absolute new boy to Cold smoking on here, & have asked many questions, ..use the search box or scroll down this section to see what I mean, you may find a few answers that i've already pestered the good foum folk for
bashing a pic or two up then!?