Ok, satisfied evic user here (and I've converted 3 of the 4 vapers I work with here to the evic, as well).
The recommendation is ALWAYS 5.2 watts, and it's no good - ignore it. First thing to do is go into the menu, select "vapor set," then "switch," and change it to "VW." That puts it into variable wattage mode, so you can stop worrying about volts and ohms and such. If you know the wattage you like, most atomizers and juices are going to work well around the same wattage. Second step is to dial it up to 8.0W. That's about the best vape I've found on anything I put on it, from ego attys to clearos to my kayfun and igo-w4. I leave it there 90% of the time.
Feel free to play around with different ranges, though - there's no safety issue to worry about, because the evic won't let you do anything unsafe. If your atomizer's resistance is too low, it will error, and it won't let you turn the voltage or wattage up higher than it can handle. So experiment with it and see what you like the best. For me, that 8 watt setting is the best balance point between vapor and flavor... it tends to burn if you get much higher and doesn't produce much if you're too much lower, but that's my preference. Yours might be different. It's a good starting point, though.