Congrats!
Most of the issues with substrateless would be due to too much air flow. You need a full seal to keep the humidity high--every tiny gap has to be closed. I tape over all the holes in my hovabators when I do substrateless incubation.
Substrate incubation is a little more forgiving of air flow, since the substrate holds the humidity where it touches the eggs. Still, I enjoy seeing nice new hatchlings pop out without little pieces of vermiculite stuck in their heat pits, lol.