Not sure about the K-simar,ButI have similar issues using the adapter with my MVP2.0 I think. I frequently have to snug the the threads or back it off before I use it. I've gotten into the habit of checking the resistance, on my mvp, if the threads are off, it will show "non." Generally giving it an eigth turn or so it will then read 1.5-1.6. It will occasionally read different numbers for the same coil, but again, a quick twist will fix that. Whenever you get the best vape, check the resistance, and than always try to go to that with that coil.
Hope that wasn't too long winded. More importantly, hope that helps.