Injecting moisture into a packjob that is to be highly compressed and selaed is probably not a great idea. I've heard of other guys hanging the reserve in their washroom and turning on the hot water in the shower to get some moisture in the air. In general, water and reserves are not a great combination and I think adding water in any way or amount is not the answer.
I pack in the basement of a centrally air conditioned home. It's very dry and cool. Not the best combination, but unless the reserve you're working on is brand new and too small for the container...it should go in once properly packed/handled. I've never had an issue.
Not trying to insult you in any way, but it's probably skill that you need to help with the reserves, not moisture. It may not hurt to hang out with another rigger and spend some extra time fine tuning your skills/technique.
FWIW, I have just a couple less packjobs than you do.
(This post was edited by Chris-Ottawa on Sep 18, 2012, 8:49 AM)