Dry hits are caused by either:
- not priming the coil well before you first start using a new coil and/or
- vaping at a wattage/voltage to high for the juice to keep up and/or
- using too high a VG ratio of juice
The Nautilus Mini uses cotton as a wick. All cotton coils have to be "primed" well with juice. If they are not primed well the cotton will burn. Unfortunately, once the cotton is burned the burned taste doesn't go away.
To prime the coil, drop 5-8 drops (sometimes less/more depending on the size of the coil head) of juice right inside the coil, another drop of juice in all the holes on the side of the coil. Put the coil in the base, fill the tank and screw the base back onto the tank. Once you put the tank on the battery give it several unpowered primer puffs. This will make sure the wick is fully saturated.
Turn you voltage/wattage down, take a few hits, bump it up, couple more hits. Repeat until you find your "sweet spot". If it starts to taste funny, gets too hot or tastes burnt, back it down. Different flavors will have different sweet spots so you just have to experiment.
I can run as high as ~17 watts with 50/50 juice without getting dry hits on a Nautilus.