I have an RS1 and nvidia 430 and have the exact same issue. I do not think I had this issue before I "upgraded" from intel gpu to the nvidia. Yes you can override and manually set it to 1080p60 but the computer has a nagging habit of resetting back to 1080i30 at times of stress, since it sees that as "native". Frustrating.
My perpetual home theater build -
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