I've got basically that same humi, though I got mine at CheapHumidors.com ( http://www.cheaphumidors.com/Merchan...ode=MDHUMIDORS )
Mine isn't going over 60%, normally varying between 58-60%, I've got 70% beads in mine that are charged correctly. I think it has more to do with the outside humidity, since my other humi is only readin at 61% with 70% beads in it.

Or maybe I'm just an idiot noob that hasn't set mine up right somehow. :)