I think that’s actually ok. The truth is that until DX12 is a ‘thing’ the engine limits exactly what you can get out of your hardware.
The game is perfectly playable at 33 fps. Having experienced the difference between DX11 & 12 in another game I’m confident that when it’s released those at the higher end of the hardware spectrum will see a big change.
Put shortly, there is nothing wrong with your hardware. Wait for DX12, it will be a game changer for people limited by their CPU (which is almost everybody with a higher end GPU). There isn’t a CPU alive that can keep up with a 3090.