[David Iglesias]

You shouldn't have any problems to reach the 90 FPS with that graphic card. I'm using a 2080 with an i5-6600k slightly overclocked and I'm able to keep the 90 FPS with 1.8 supersampling and many settings in high even playing against the IA.

I'll upload my settings later but I remember that SOL and some CSP features were causing me a lot of frame drops when I configured the graphic settings. They are amazing but I've read that are not well optimized for VR so your problem might be there.

Edit.
These are my settings. The FPS boost came after using the Natural Graphics Mod instead of SOL as post processing filter.
https://imgur.com/a/BHEWou9
https://imgur.com/a/2jxCnSd

Hope it helps.