There is much detail in your post so I've probably misunderstood something but why 130 tiles for the gpu render? Default GPU size when using Superfly is 256 which suggests you're doing a very large output image or you're using an inefficient tile size. A 1080 should be able handle 512 tile size for most scenes. Details such as output render size, render settings, GPU utilisation during the render and the poser log would be useful.