Misting is a great idea! I have an automactic mister right now and I need to make it go off like every hour for 15 seconds and I still only hit 40% on a good day. If I did it anymore he would be in a swimming pool!
So yeah what I was trying to get at is misting twice a day is one of the best ways to get it up, but get that tin foil on and maybe you won't have to mist all the time. Maybe just once a day!
But it needs to be at least 50% I'd say!