I have an odd problem. Or maybe a silliness problem. I have 2 EXO RTAs and 2 OBS Engines. I have identical claptons in all of them, bought them from Adavnced Vape Supply. One EXO is single coil deck the other dual coil. I have had nothing but trouble with the dual coil deck on the EXO. I put it on a G Class, read the resistance, it is .21xx, put it on an ML Class, same. Put it on a DNA, same. I put the Engine on the same mods, same resistance except for the xx part of the number. So, I set the Yihi mods to 65J, 420F. The Engine produces a great vape, hits temp quick and holds it there. I put the single coil EXO on, read resistance, .40xx, seems a bit different as it is the same coil, just single. But, it vapes well with 35J 420F. The dual EXO at 65J hits about 360F but is a VERY hot vape. Too hot for me. I've checked this and that, but if the resistance is accurate and the mods work, what else should I look for here? Thanks.