I found with microcoil/contact coils, burning the center out from I assumed lack of juice flow or whatever reasons was most of my cause of harsh. I don't bother with contact coils at all any more at all. I was just never able to grasp the concept of having the coil bound tightly together and how juice vaporizes when there is no space to release the vapor. Claptons are a bit different than single wire but IMO your still restricting the vapor using a contact coil clapton. Just like vertical coils, seeing on all the videos of how much juice splatters when fired, all the juice splatter goes into the center of the vertical coil and a mist of hot juice goes right into your mouth....I just see no reason in that.