rename your saved games folder to DCS.old or something and have the game create a new saved games folder. Then move your mods/inputs/bindings/whatever back. This has almost always solved weird little issues with VR for some reason (even ones that deleting FXO and metashaders wouldnt fix).
Not sure why, but its an easy thing to try and has great results.
Also try completely removing SteamVR (google the correct way, IIRC you delete the default.vrsettings file from the steamVR folder, and a couple of similar files in the steam config folder.
I havent had too many CPU usage issues, but most of the issues were resolved with updated files completely unrelated to what you would think would be causing the problem.