Stop turning anytime during Day 18. And keep the vent plugs in. Yours has a fan, right? Well, at least on my Hovabator, there are small holes around the bottom of the bator that allow air to come in, but I am not familiar with the one you got from Jaynie. When the hatch begins, one plug will need to come out then at some point, probably the other as well, because the humidity will shoot up with the opening eggs. Maybe someone with that model can verify what I've told you as well.