Can you please explain the settings on Clear & Brilliant laser? How many passes should be done and should I start on high?

I have had fraxel several times back when they painted you blue. It helped my acne scars quire a bit. I still have mild shallow acne scars but I don't want the downtime or expense of the super deep lasers. Then I had the newer fraxel that doesn't hurt and it was a waste of time and money. The texture still isn't great but much improved from where I started. I know from experience laser settings matter. I'd like to understand the settings before I buy a package deal. Thank you!