Your gpu is definitely used in this game - graphics pipe is used in 100%, but you have very low clocks like on POWER_SAVING profile. Which power profile you use? Based on screens and my experience I would say this is POWER_SAVING profile. Try to switch to 3D_FULL_SCREEN - that will set much higher limits, you can do in in many ways, I use corectrl for it, but you can easily do it manually by writing to correct file.