Embarrassing, but I think what i was seeing was different levels of juice being burned off the wick after filling. As soon as I would empty the tank, and dry burn, the coils would magically all be firing evenly. When the tank was full and the wick was wet, after burning it for a bit, the coils would randomly appear hot. This is the only thing I can think of what I was seeing. Because its performing amazingly well. I'm revisting juices now and all vape much better than with a vivi nova.