The Epson pretreat works best. However I have doing some printing with Image Armour Ultra, which is a very quick setting pretreat made for Brother ink and Aeoon printers.
Also the type of paper u are using for curing. Epson doesnt seem the like the kraft paper style sheets. Increase pretreatment to 24 grams if using IA dark 20 with Ultra dark. Epson around 20. When in doubt use more. Epson is like IA in that it really doesn't have the application window that dupont has. on Neo Rip use high res to get very good white ink coverage for white lettering etc. Changes coming to further help in that area. Although I have had excellent results and find that any white problems are pretreat related. Also u can double strike the white if need be. On the Que manager on the bottom. Rip the file first then right click on the file a popup will appear, there u can select just to print the. Color or the white layer . Handy for other things as well.