The single biggest problem I had was the unit wanted to run too cold all the time. These units the fan did seem to run all the time. Running all the time to keep cold was not a problem, taking all the RH was the problem it caused, opposite problem as yours for some reason. I went and bought this:
http://www.williamsbrewing.com/CONTROLLER_II_P183C100.cfm I set the controller to turn on at 70 degrees and turn off 4 degrees cooler. My shelves stay pretty close to 68 degrees and 63-64% RH all the time now.
To keep my RH in balance, I started with 1lb of 65% beads from
www.heartfeltindustries.com placing 1/2 on the bottom and 1/2 on the top shelf. They were not able to keep up with the RH being drawn out by the fan. So I added a shot glass half full of distilled water and a couple small strips of the green floral foam. Was better, but had to add water a couple times a week. I ended up getting a Cigar Oasis
www.cigaroasis.com . This solved everything. I keep the Oasis on the bottom shelf and put all the beads on the middle shelf up front as the cool air comes in from the rear and most RH loss is from this area.
Trial and error over several months worked for me. Just take things slow and stay on top of things until you get your unit working perfect in your environment.
Good luck.