What are the optimal settings for spot size and joules with the Piqo4 laser for black ink? (Photos)

I recently had tattoo removal on an all black full sleeve tattoo with the piqo4 laser. The tech used the 1064nm with a spot size of 6.5mm and I’m not positive on the setting she used for joules. I didn’t see any frosting during treatment or clearance after the fact. I previously treated the tattoo 4x with a nd yag q switch and saw some fading. (If you look at the picture of my chest the tattoo on my left side was untreated and that’s how dark my right arm was originally)