Just for a little clarity on terminology, what you are calling Nautilus WICKS, I will call them what they are called on the aspire replacement packaging, aspire refers to them as atomizers. I have noticed some people call them coils, and truthfully, they ARE coils, but to the rebuilder a coil is a handmade coil less a wick, and a wick is just that, a wick- a piece of cotton or synthetic wick.
When I bought my Nautilus, I also bought two 5-packs of spare 1.8 ohm atomizers. I have not use the 1.6 ohm atomizer that came with it, it is still in the box.
I rotate two of the aspire replacement atomizers back and forth when I clean the tank. I mostly clean the tank when I am changing to a different juice or about every other refill of the same juice. I soak the atomizer I take out at cleaning time in pure grain alcohol (moonshine) overnight, then I put it into some boiling hot water for a few minutes, maybe about 5 minutes, and then set it aside to dry. The next cleaning time I switch the atomizer out and repeat the process. I have been using two atomizers for about 3/three months now. I also keep my volts/watts set down to a level that produces decent/good vapor but not high enough to burn my juice. I have my MPV, VTR and VV spinner, ego style battery - all of them are set at 4.2 - both my atomizers tested at 1.9 ohms when I began using them, and have remained at 1.9 ohms all through these past 3 months and are still performing flawlessly.
I also use a Kanger Aerotank on the MPV, VTR and VV Spinner, I do the same process with it as well, I am using a 2.0 ohm atomizer replacement with it, having the same results over a similar time period of use.
I hope that info helps you somehow.
CD
