I have almost the exact setup you have, except the RAM and I’m using heroic launcher. I have no issues with CP. My go to with game issues is to monitor the components in game. Install mangohud, configure the OSD to show CPU temps, gpu temps, clocks and also usage. That will help narrow down if the issue is hardware or software.
Yes it is. And you can look up a video on how to install it too. There isn’t a GUI, just a text editor. And you set launch parameters for it to show up in steam. Or lutris has the option for it in settings.