Finally fixed that nasty seam running down the middle of the mesh. That happens when you have mirrored Normal and UDK just flips out. Apparently there are workarounds for it but after trying several times it simply didn't do the trick for me. So I decided to just UVed and bake the Normal on a full tile floor instead of only half and mirroring it. I was also told that I could have design the floor so it would have a natural seams in the middle where you mirrored the geometry. Maybe next time I'll just do that since that will give more texture resolution for the floor. Now that I have finally finish fighting with most of the tech problem (hopefully all) I'll get to the texturing process.