This link should help you out (even though it has a different name on the RIP, it is from the same RIP manufacturer) - MultiRIP GP dtg Layers Guide PDF. It explains the different layers when using the Print To Application.
Another really easy way to print the white by itself, is to just add 2% color such as yellow, or magenta to your white and send it as a color layer. I have done this as well. The soft mask is not a solid mask but more of a highlight mask, and the hard mask is a layer that is solid under all color. At least that is the way it looks to me when I print the separate masks with my hm1
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