I set input to Rec709
This is what is wrong.
You're compressing eveything to a small color space, then expanding it to a larger one.
Convert MLV to CinemaDNG. Go to Resolve and configure it like this image bellow. Do the color grading and export to ProRes 422. I suggest you don't make these "teal and orange" forced gradings, as its very ugly visually, especially if you use some LUT to do it automatically.
