Mirroring seams

Shrike

Hey, so Im tring to bake this Rim piece and its 4 repeating pieces to save UV space

My normals are all ok, and ingame the model dosnt have any seam, but the normal bake comes out skewed at the edges


The model consisting of the 4 repeating pieces is collapsed & welded
Oddly I do the same (but with 2 pieces) for the tire, and its perfect there.

Using a cage in xnormal, is there something I am missing? 

polygons

Sometimes rotating the uv island and rebaking it can fix this but that is my only idea. 

Shrike

Turns out im retarded, the highpoly has the seams because its not welded, just wow
What are the odds that the highpoly is the issue