DISCLAIMER*** New to Toms and also new to building (although 10+ years in IT/CS)
I just bought a 6700k too. I had the worst time with my voltages OOTB. The MB on AUTO CPU Core Voltage had the voltages from 1.36 to 1.41. I have it currently running stable at Adaptive with 1.300 (after testing manual at that voltage) with an 4.6 GHz OC.
My idle temps were pretty high before that (like yours), I thought my H100iv2 was to blame. Once I cleaned up the voltages the idle temps went down. The Corsair hid the voltage issues from me, since, although my temps never got out of control, they werent really where I thought they should be.
56 as a maximum sounds pretty darn good to me, but again, I am pretty new to this. I currently am 8...