This my Designer material with the height map under. And this is the same material in Painter on a High res plane besides the fact that it looks horrible compared to SD... And this is how the height map looks like... Any idea why? thanks.
The heightmap looks like that because painter uses signed values for height. What would be 0.5 in designer is 0 in Painter. It's just a visual thing, your height should be fine. I've no idea about the displacement as I've never tried it