Single Status Update
Make sure the Roku TV is set to HDMI 2.0. If not, you won't get full FPS. Also, make sure your physical HDMI cable is 2.0 compliant. I moved to a Roku 43" and I have GTX 1070 as well, and I can normally game in 4K at 61 FPS (the recent patch has screwed that up).
The setting for the Roku is like 4 layers deep, so make sure you get that set.
@RevTKS THANK YOU! I did purchase a proper HDMI 2.0 cable when I got the TV, and I checked into the settings of the TV and discovered I had HDMI 1.4 set up for my input. This was 100% the problem. I just played a battle in 4K and it was ROCK SOLID 61fps at maximum settings. I OWE YOU!!
Anything else I should know about improving the picture quality on this Roku TV?