Cabinet incubator staggered hatch....Any suggestions?

Is there a trick that will allow a staggered hatch in a cabinet incubator? I just got the Brinsea cabinet and it has 3 shelves but a large bottom space for hatching. My eggs are set Monday,Thursday, Saturday of the same week...

Can I leave the humidity at 55% at lockdown and put the ones due on the bottom shelf with some wet sponges or something?

I have a Hovabator...which is an egg killer with this cold and drafty winter...but, if there was no way to do this...I could move some eggs over there.

Thanks for your help!