I recently hatched some ducklins and kept my temp at 101 with the humidity 60-65%, ducks need higher humidity than chicks so make sure you put a bowl or sponge of water in your makeshift bator. Good luck, I hope you can get some babies!
P.s. Look on the homemade incubator forum and I bet you can find something that is better than what you're using that is simple and quick, again, best of luck to you!