I use substrateless incubation.
I put the water catch tray in the bottom of my Hovabator, then put in the enclosed screen. Over that, I place a piece of fluorescent light grid, cut to fit. Water goes in the tray, and eggs sit on top of the grid. I can add more water if necessary during incubation.
Hatch rates are great, and the hatchlings don't come out with vermiculite adhered to them.
I don't worry about water sloshing, because I don't move the incubator once it's set up.