I am getting the same problem, except it is on almost all games. I have very good airflow in my Corsair full tower case, so my temps never go above 55 degC at max load. My GPU usage is between 95-98%, and my CPU usage is between 30-60%, depending on the game. I am running 1440p res @ 144Hz with Gsync. I used DDU to wipe all previous display drivers, and reinstalled GeForce Experience and the latest Nvidia video driver. Below are some FPS results from Battlefield 1, Rocket League, and World of Warships along with my system hardware:
System Hardware:
Case: Corsair Obsidian 750D Full Tower
+3 case fans and controller
Motherboard: Asus Z97-A
CPU: i5 4690K (OC to 4.2 GHz)
CPU Cooler: Be Quiet! Dark Rock 3 Tower Fan
Memory: Corsair Vengeance 16GB (4 x 4GB) @ 2133 MHz
Storage: 2 x 500GB Crucial MX100 SSD, Raid 0
GPU: Asus ROG GeForce GTX 1080 Ti Strix Gaming
Display: Asus ROG Swift PG278QR 27.0" 2560x1440 144Hz Monitor
PSU: EVGA G2 1000W Gold
Game Results
Battlefield 1, 2550 x 1440p, Ultra Settings
40-50 FPS
Rocket League, 2550 x 1440p, Ultra Settings
25-40 FPS
World of Warships, 2550 x 1440p, Ultra Settings
65-75 FPS
The CPU is not bottlenecking my 1080 Ti, so i have no idea what the problem is. I should be getting 100+FPS in all those games with ease.