TurboPrint & PrintFab

I have a epson ET 2750 I want to print in black and white. In the color tab I choose color mode = Grayscale and intent=Perception. In the Ink Control tab I scroll the Black level control to max value, so the image must be printed only using black color. But it only prints in black and white (only us...

I have a epson ET 2750 and the above only works if you have selected Matte or Plain paper.
If you select semigloss, gloss or other paper type the printer uses all the colors to build the black and greys tones.