Blurry warp/planar/triplanar projections in Painter

Does anyone know a trick how to have projections in Painter  more pixel to pixel accurate?

I recreated  the planar projection   in Designer using  planar projected UVs  and rebaked them as xy gradients   to target uv set as 32bit floatin exr image . Then ussed it instead of

'get position"  in pixel processor.

Turned out to be pretty  ok and  visibly  less blurry  than  projections in Painter  where the extra blur my guess comes from  positioning the projected plane itself .

But when I bring it back to painter as sbsar it's no advantages at all.  Now I am lost.