Dot loss question... darker print with inverted image on black garment

[Hugomartin]

I noticed that when i print the image, the t shirt was slightly darker than the Photoshop original... Now is not technically dot gain cause the image is white and the black comes from the garment... So what i got is dot loss... So i adjusted the curve on darks 5 porcent on my image on screen and it showed same as the printed one... Is that the 5-95 % grayscale ratio that is really printed? How do you adjust your screen to actually work inside that range... that way what u see is what u print?

[J-Man]

Hugo you should post a pic of the photoshop original and actual print so we can get a visual man