I do staggered hatches in my GQF cabinet incubator. I just leave the humidity alone until right before hatch starts and move the eggs to the hatching tray at the bottom for hatching. This way I don't have too many high humidity days on eggs set earlier and no upset to the other eggs. I don't know what incubator you are using and I have no experience with table top models at all. I run my humidity between 25% and 40% but try to keep it about 30-35%, This works for me, but I do know (from working in ND) your natural humidity is much higher than mine. I would recommend you candle your eggs and follow as closely as you can with the air cell chart you can find online. This way you can tell if you need to lower your humidity or increase it for best development of your eggs.