Ok i'll start with these settings, I have the ASUS 1070 DUAL 8gb model, and it comes with a 1x8 pin power connector.
only 1 x 8 pin sounds like lower TDP - you might need a higher power limit - maybe start with 70% and just take clock -100.
for ETH you should get ~ 29-30 MH/s with your card i think.
keep also an eye on the temperature, i would keep the card below 70°C (i personal keep them even at max. 65°C)
If you mine something like ZEC, HUSH, ZEN, ... you need to put also core clock a bit higher, maybe +50 to +100 in that area and keep memory at +400 or even +500 (wherever it runs stable without any issues or crashes). you also need ~ +10% Power Limit to whatever you have at ETH as this currencies take more power.