Very strange - I use to use the Nauti mini and full size before switching to the Kabuki. I made the switch, as you did, due to the great reviews on this forum. I also mainly use Rocket Fuel Vapes juice (70PG/30VG), just not Reaper. I use five of their flavors, and they are all fantastic in the Kabuki...better than any of the Nauti's I have used. When I start a fresh juice, I simply put a drop in the four small holes on the new BVC coil, and after installing it in the base I put a few drops in the top of the coil. I then let it sit vertical for about 10-15 min. After that all is good, but it does improve a bit more on the second fill.
That being said, I use the ProVari P3 and Radius, which is so much better for the vaping flavor, even with the old Nauti, not to speak of how well it vapes using the Kabuki. Not trying to up-sell you to the ProVari, just trying to let you know my experience! I vape at around 10.4W, but have to agree with the others, that I got to the 10.4 setting by taste, rather than looking at numbers. In fact, I am so happy with this combination, that I will soon be getting a second Radius.
Hope this helps some, and good luck finding the right combination.