I don't know what you have access to, however, spin coating is another common way to get a thin film. Fix the bottom plate of glass to something spinning and then add the wax and allow it to "spread out". Attach the upper layer aftterwards.
Otherwise, you might want to increase the size of the vent slits in your tape spacers to make sure that you don't entrap the air (i.e. more room for the wax displaced air to escape).
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