I'm noticing someething strange when I change my wicks on my Cyclone. One of the coils looks clean but the other coil always looks blacker and dirtier, for lack of a better term. I make sure the screws are tight whenever I change wicks. The coils are the same size and even rebuilt both coils the other day thinking maybe there was an issue with the one. I just went to change wicks again and noticed that the same thing is happening with the new coils. One is clean and the other dirty. Any ideas from you Cyclone experts on what they issue might be? I can post a pic but you would basically see what I've described. Thanks.