It probably doesnt matter now but I have found that when using the substrateless method with a grate, hatchrite seems to hold the humidity best. I had the incubator running for a month before I had any eggs. 4 egg boxes with about 3 inches of hatchrite. A grate on top of that. They held 90/100% humidity for 5 weeks. I added a bit of water about a week after my first 2 clutches were down. They were still over 80% humidity at that time too. Now they are back up over 90%.
That stuff is more expensive but it seems a little more worry free. Especially if you have less than 10 clutches a year.
I thought substrateless is water and an area to place the eggs? How is using hatchrite considered substrateless?