I've also reported the graphics issue on Steam as it resets them when you reboot the game so they are impossible to set.

Btw using mGPU will only at best go twice as fast as the slowest card, so your 570 would be highly likely to slow your Titan down and give you worse results. Especially at your resolution and high settings as even if your 570 had the graphics crunching power (which it doesn't) it certainly doesn't have the VRAM for it. I'd stick to just the Titan.

Just as an aside, if you want high FPS without any real visual loss try putting the Terrain Shading Samples to medium, that setting is very GPU expensive (Also VRAM intensive I think but I would think that would not be an issue with a Titan X).

Edit: Sniped by Moomo

Ah I see. High probably is the old medium then as I think a lot of this stuff is likely to be just a name change from low mid high to low high ultra. IF it is just a name change I can see their thinking behind it though I don't think it truly necessary.

I suppose it is possible there is meant to be a "mid" in there too which would mean there are 4 levels in total and Ultra is a new level above the previous available options. That would make more sense really, though only the best GPUs would be able to run it. Then again that is the expectation with Ultra.