The Nautilus 2 that you have comes with 2 diff. Coils.. the .7ohm and the 1.8ohm coil.. I understand what you are looking for I myself do not like a ultra smooth vape it needs a little bite to it. Here are some suggestions
1) try using a 50/50 Vg/Pg eliquid
2) Menthol vapes pack a good punch
3) .7 ohm coil try 12-18mg nic.. 50/50 ejuice ( I would try 12mg, 18 might be too much.) 22 watts
4) 1.8ohm coil try 24mg nic with a 50/50 ejuice that should work for Throat hit
The Nautilus 2 is a excelent tank, I have been Vaping for over 2 years and I still have my Nautilus mini ( the older version). I have many other tanks but still keep the Nautilus in my rotation. It's that good. You don't need to buy another one, you just need to find the right juice for you and the right coil that goes in the Nautilus that fits your liking. The have like 6 different types of coils that will work with your tank..