S80600 w/Onyx. How to print more white?

I've been trying to figure out how to get my epson S80600 to put down more white under my colors. I'm printing on ij180mc-114, and I've tried everything I can think of to get it to put enough white down so the blue I'm printing on top doesn't change colors when the material is applied to a colored surface (metallic gold paint in this case).

I'm using the profiles downloaded from epson/3M, printing 720x1440 16 pass, and in the printer settings box I've got it at 32 wh - 2L (the only option), with the ink density turned up to 400%.

Is there anything else I can do to add more white underprint to block out the underlying color and keep my colors on top from shifting?

 

How can I multi strike only the white?

 

I suppose I should have clarified that response. Multi strike in the settings on the printer hits every color that number of times, correct? How can I just have it do the white extra times so the color doesn't shift?

 

I hadn't, no. Going through those settings still doesn't give me enough white to keep the color of the part from shifting the print.

 

It's definitely printing white. Just not as much as I need. I'm sure it's possible the printer+software combo can't put down that much white the way I need it to. I'm basically getting 2 layers of white (I think), when I need about 4. On our rolands I would have set it to print white, let it dry, and then suck it back in and print again, but I don't believe that's an option on the epson.