The old damp paper towel trick

Good morning guys, I have a couple of clutches in the incubator. One has started to dip a little after day 7 ish, the subsrate is wet enough so ongoing to try the old damp paper towel trick to see if they plump up Any. Just wondering if it's as simple as placing a couple of sheets of damp kitchen roll over them and leaving them for an hour or too or if theres something else should know,also if anyone has any before and after pics to show how effective this is I'd love to see some

Pictures?

If the substrate is wet enough yet dimpling is happening already it sounds like the tub isn't sealed well enough to hold the humidity inside of the tub.