I am having this issue right now... 30% humidity in my shop and it's really bad. Hair stands up on legs when walking close to the machine!
Got through some prints by standing behind the machine with a bounce pad wiping every metal surface unexposed, the platen, the frame... had someone stand in the front of the machine doing the same thing :Big Laugh
Brought in a little home humidifier, ran it for a couple hours.. no difference. I am looking to get a bigger one, plus I ordered one of these out of desperation:
http://staticure.com/?page_id=548
I'm surprised you're getting that with 60% humidity though!