Guys, the way that worked perfectly for me to fix the resolution problem is like this.
- Install Elite in the FD launcher, that file is independent than the one of steam.
- Launch Elite in the FD launcher, NOT from steam, the regular 2d Elite.
- Open SteamVR and have the headset and base station ready.
- Go to the graphics options and under "3D" select HDM Headphones.
- Restart Elite FROM FD launcher and you are ready to go.