Hi. I've been vaping for about 8 years. I never got into temp control until now. I got the Sigelei 213 last week. Had the 150 before this. I picked up some 24ga 316L ss wire and wrapped two 7 wrap coils on a Griffin 25 tank for a .14 build. Selected ss in temp mode and 316. I set the preheat to 70 watts for 1.0 second and 400f. Some times I get a good solid even hit on my draw but most times it hits good for a second and then drops off to almost nothing. Not sure what I'm doing wrong. Going back to power mode at 70 watts and it works great. I have upped the pre heat but it's too hot. I have cranked op the temp to over 500 and that didn't work either. I have read many good things about temp control but so far it's not working for me