You may have to edit the grey and add a little extra yellow if CMYK or green if RGB.
You may notice no change at all then a sudden change as you pass a threshold.
Depending on the black that you have you may be able to set the printer to 'Use black only' or something like that.
Sublimation black is usually made of Cyan, Magenta, Yellow, and brown.
Also see if you can set the program to 'Spot Colors'. If it is a bitmap the software probably uses perceptual, great for photos because it tricks the eye into not seeing the limits of color by altering what is there. It is terrible for spot colors because it alters the colors.
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