@CobaltUDK in case you want to try it my solution is below
0.0 disables it and it expects negative values. the higher negative value you go the more it will alleviate shadow acne but also the more it will parallax the shadows as the camera moves. you’ll have to find the sweet spot for you
also you can see my Custom node allows you to do stuff only in the shadow pass so it might be useful for other things 
sorry for hijacking the thread as this stuff isn’t about DX11 - but I’ll get to that eventually 