Fluence settings on Enlighten by Cutera?

I have had 3 tattoo removal sessions so far. 1 at one location. And then the last two at a new place. They are using Enlighten by Cutera on my all black tattoos. The first 2 sessions the fluence was at 1.5 and the 3rd session the fluence wasat 1.8. The tattoos are not fading as fast as I would expect using this laser and I am curious if the fluence is not high enough. My skin has been handling the treatments with no issues at all. Its almost as if within a day I forget I even had it done.