OBS Studio is excellent, but it does take some tinkering as you say. You might be having some issues with the output settings, especially if in game is totally fine, but I believe OBS has an included preset for YouTube which you can set Frame Rates at which is easy. And ofcourse make sure you choose the right kind of capture, as said above, display or window capture is much harder on the computer than simply using Game capture which is designed for that exact use!