SLI is definitely working now. There are finally no flickering rivers, textures, shadows etc. and a huge performance increase.
I'm sure someone that knows about nvidia inspector could actually set up a correct profile to get even more performance, but I simply turned it on globally (so it's always on) and the results are astonishing.
This is me running the black death track at all GFX settings on MAX including SSAO. I averaged around 50 FPS. Pretty good for a benchmark track. A couple setting adjustments and I can get 80-100 FPS online at all times now.
I captured the last screen shot right before the black death track ended to show the results I got throughout.