If you think your humidity is correct with a correct temp, (45% to 50% humidity, 99.5 temp), and the eggs are all being turned and set large end up, incubator in a room with constant temps humidity and no drafts, I would just sit back and wait! You don't have to candle eggs. If they are supposedly fertile, then you should be good to go.
What day are you on?
What day are you on?