You have a different one than we do. We have the titanium and there are 3 wattage settings, 600, 900 and 1800 if I remember correctly. I'm currently being held captive by 1 of our pugs so I can't get up and look. The display for the wattage is top left just off center though.
The temp increments are in 5 degrees on ours.
When I fry, I set the temp on the burners about 15-20 degrees higher than what I want the oil temp to be. I haven't used a thermometer to check the exact oil temp, but the frying has gone just fine doing it that way.
I haven't noticed any difference in heating/coking times between carbon steel, cast iron, enameled over CI, or regular induction ready cookware.