Need some help removing texture seams

[Lateraliss]

I'm making some new textures for a few walls in Solitude. I'm having trouble with visible seams. I created normal maps for them, and while they seem a little glossy, they're ok for now. What should I be doing when saving my .dds to make sure seams don't show?

I think one thing I'm going to do is edit the original image to be more uniform. I think that'll help with the mortar lining up correctly, but I still have seams.

http://i.imgur.com/ffVlw.jpg

 

http://i.imgur.com/tLmbT.jpg