Where are your emdc's coils from? I just tried black,stainless,brown and black and gold from vapingzone no gap on my battery. I do not have any old smok tech egmdc left to check them. However I dont have a joye ego battery to test but rather a battery made by the same company that makes vapingzones ego twin coils
I know you weren't asking me...but my VZ EMDCCs and the Smok EMDCCs from Madvapes both fit my eGo batts just fine. There is a small gap on the VZs though. The VZ cartos do wobble just a bit too, but that's no biggie!
That said, my third EMDCC is hitting more like what I'm used to now. Still doesn't sound like a mad viper like the old ones did, but I'm liking it better than the previous two. Makes me seriously wonder about QC on these things...