To me the most interesting part is that it's not necessarily a problem with transcoding video from a composite input to another, higher quality, output. I had the exact same problem when I passed a composite signal into the 1070 and got my output on composite as well. Likewise it's only certain pieces of software that cause the problem. In my limited experience only two titles have ever caused this problem so I'm going to classify this as relatively rare. But the fact that multiple types of hardware are all showing this to be a problem is what really starts to get to me.
At this point I've been testing and trying everything I can in order to try and get it fixed on my end and I have come to the conclusion that this is most likely a problem with the 1070 and something that the Outlaws need to be looking into.