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Quoted from GibbZ

It feels like the crosshair isnt in the dead centre of the screen. I used the changes and used the numbers for 1024×768. Is it because there is no direct centre of the crosshair to be on the most centre pixel?

Adjust xpos and wide to move it horizontally – xpos to move it 1 unit, wide to move it 1/2 unit. Use ypos and tall respectively to move it vertically.

As you can see, it’s not possible to move HUD elements on a per-pixel basis, only with vgui units which are constant on the y-axis (480) and variable on the x-axis (480 / y-value of screen aspect ratio * x-value of aspect ratio = 640 in your case).