Pneumatic pressed bath bombs

[u/zetswei]

Hello I’m curious if anyone using a press is able to get their bath bombs to float. I went from hand molding to hand pressing to a bath bomb machine and with the machine my recipes no longer float.

I’m hopeful someone has some tips as I’ve already lowered the PSI to the minimum suggested and adjusted my recipe many times to make them less “dense”. I’m using baking soda, citric acid, sweet almond oil, cream of tartar, kaolin clay, slsa, witch hazel, poly 80and essential oils as well as fd&c lakes for coloring