So I've had all the same issues as you guys above but I've found a solution for myself. So my general audio set up usually has me having my PC's volume at 100% and then turning each game down within the games settings accordingly. So for instance World of Warcraft is on 3% and Heroes of the storm on 10%.
I noticed that if I brought my PC's volume below 75% the static would disappear. So I reduced my PC's volume to 50% and increased all my set game volumes to double their original values and WHALA! Sorted.:biggrin: