Nautilus coils have a break in period, you said you've had it sitting at 7 watts which is good (better than burning the wick right away, there's pretty much no coming back when they get burned), you want to start around 7 or 8 watts and over the course of a day or two inch it up a half or full watt every mL or two until you reach between 10-12 watts, which I find is the sweet spot on those coils. The muted, strange flavor is unfortunately pretty standard when you are first breaking it in (I think its the somewhat controversial wicking material), but after about a half a tank and by the time its up to 9 or 10 watts the flavor should break through and become much, much better than an EVOD. Breaking them in this way should give good flavor and long life, about 1-3 weeks depending on juice and consumption habits. When you hit higher wattages you'll probably find that the two higher airflow holes are where you sit at, though that is completely subjective and will feel pretty different from an EVOD at first.
