I have a 6700k with a reference 980 (not TI) and mine runs super smooth in all games. You must have some background process eating up your performance. Don't expect a Vive/SteamVR update to fix it. Kill all unnecessary background apps and try again. Go to your start menu and search for msconfig. Look at the start up tab and disable any unnecessary apps from running on startup. Also make sure your antivirus is disabled or in game mode.