You will need to change your UV's in the UV editor. The seam placement is where you decided to make your UV cuts. If you are unfamiliar with the process I'm pretty sure there are a number of videos Autodesk has put up about on YouTube. If they don't, just search for "Maya UV editing" and that should result in several video links. Maya has one of the best UV editing tools of all the major 3D applications. It has a large tool set for doing exactly what you need to do.
If you can't or don't want to change the UV's Substance Painter has the ability to paint across seams but it doesn't work well with procedural textures or displacement or height maps. Your best bet would be to correct the problem where it begins and that's the UV's