That may have been too high. I know for my area, that would have drowned them. I need to maintain a humidity of 30% and no more or my embryos will drown and not hatch. Humidity issues are the most common cause of late death incubation, so I'd play around with humidity and see what is going to work for you. It would be a good idea to weigh the next batch so you can track moisture loss and adjust humidity as needed.