The name is marketing not an measure of expected performance. In recent generations ... going back to the 5xx series, the SC has been repeatedly noted for having weak VRMs and VRM cooling. This stems from the fact that in almost every instance, and unlike competitor offerings, the SC is basically a reference card with reference VRM, little attention to memory and VRM cooling an the substantive difference being it has a better cooler.
When did you buy your 1070 SC ? If it was manufactured before November, it would be the original thermal design which is missing thermal pads. Even if purchased after, depending on how fast your retailer turns stock over, you could still have one that sat on the shelves for a while. So 1st thing to do would be to check and make sure you don't have one of these. If you do, send in for the thermal pad kit and apply the BIOS (which increases fan speeds)
it has the thermal pads and kit i dont mind the temperatures till it gets to above 77C
http://www.evga.com/thermalmod/
Despite EVGAs damage control and forum postings stating otherwise here and elsewhere, both the SC and FTW lines are affected. Installing the pads take about an hour and there's many vids on youtube showing how.
http://wccftech.com/nvidia-gtx-1080-1070-evga-cards-dying/
http://www.guru3d.com/articles_pages/evga_geforce_gtx_1070_sc_superclocked_gaming_review,10.html
As for OC settings, you can look at the ones here to get started:
http://www.guru3d.com/articles_pages/evga_geforce_gtx_1070_sc_superclocked_gaming_review,29.html
Core Voltage : +100%
Power Limit : 112 %
Temp. limit : 92C
Core Clock : + 120 MHz
Memory Clock : +600 MHz (=9216 MHz effective data-rate)