Light bleeding

Hey guys hopefully you can help.

Im having this issue and Ive seen a lot of threads about it. Not sure what to do. The geometry on the arches is smapped to the other surface (not stitched). I tweaked the shadow properties under the directional light already and no good since I still have the issue with the skybox ambient. I even tried putting a 3D plane above so it blocks the light but it didnt work.

The first example is just the one Directional and the Skybox ambient and the second is just the Skybox.

Thank you peeps.