Gfx cards under utilized

Hey all, I have a i7 4790k 32gbddr3 and 2 amd r9 280x's oced to 1080mhz. I'm getting like 30-40 fps with like 20 percent utilization on first card and idle on second. Cpu is at 10%.
The problem is my gpu is running at 500mhz because of amd's power save function that you cannot change. It will change automatically when a load is encountered. This leads to a lot of stutter.
I was curious if anyone else had any suggestions to increase gfx utilization.
The problem is my gpu is running at 500mhz because of amd's power save function that you cannot change. It will change automatically when a load is encountered. This leads to a lot of stutter.
I was curious if anyone else had any suggestions to increase gfx utilization.