Nice filter results! I strained out an old glitter grande and ended up with a lower water level when done too, seems it vanished into thin air! Liquid level will rise once it gets hot, hopefully it will rise up under your top cap.
Yep exactly! I'm heating it up now with the rubber stopper slightly open to let out some pressure. Depending on the flow I will prepare my distilled water accordingly with or without a little epson salt. This lamp was originally about 1" below metal top cap full. So I'm missing roughly 2".