No DSR ever. All default , through nvidia control panel.
Divine Pain screenshot of settings is a must? I say, all options in game sliders to ultra, 1920x1080 and hairworks on.
So expensive card and dips to 37 fps is riddiciouls. I dont think is normal. But suggesting from GPUZ ( gpu load 96-99% ) ?
If someone is trying to help you, the least you can do is give them the information they ask for.
Please post screenshots of your settings.