Nothing wrong with temporary high humidity. I LIKE to give my cresties a HEAVY misting. They may get more of their drinking in by licking droplets off of leaves than from a water dish. A few hours of 100% humidity is no problem at all, and probably a good thing.

The one thing I've learned about keeping cresties is that they do best when you keep it simple.

Mist once or twice a day.

Put CGD in for 24 hours (more than your gecko will eat overnight). Remove after 24 hours. Do this at least 3x a week.

If you want, throw in a few crickets once a week. You can gutload them with CGD and dust them with calcium if you want.