Quit messing with it lol. Let it do it's thing. It doesn't need to be constantly sprayed, that's what the dome is for. As long as the medium is moist it will produce humidity inside the dome.
You don't need to be spraying it. Too much moisture is what causes dampening off. If the medium is moist and there's humidity in the cup it'll be fine. If you spray anything, spray the inside of the cup if it looks dry..