I clean installed the drivers and it made no difference. I'm using two monitors and they're both dvi so the 2nd monitor is converted to dvi from display port. The conversion might increase power consumption and the 2nd monitor is at 1080p but can only run @60hz.Could try reinstalling drivers ticking the clean install box. At 1440P 144Hz my 980Ti idles at 135MHz. Though I'm sure in the past it has idled at the wrong speed and reinstalling driver fixed it. Also if you are running 2 screens then your idle clocks will be higher.
If there's just some way of controlling these idle speeds or preventing the jump to 800mhz by adding in a 300mhz step for example.