OMG YOU SOLVED IT!
Solution:
1- I CLOSED Steam VR
2- I launched the game through the Oculus Link (INSIDE the headset), this is VERY important, this is what was causing my problem. SInce I always launched it from Steam, steam VR would open with it, but if you launch it through the headset it will give you an incompatibility error and suggest you close Steam VR, since “having it open would cause performance issues”.
3- I activated VR from inside the game
4- Voilá, 35 solid fps !!
I would have never found the issue without your help man, thanks a lot!