I'm going in for an R20 treatment. Would like to know some more info to be sure my technician will be doing the right thing?

I know what it consists in an the basics but would like to know some more information. How's the aproach with the R20 protocol for someone like me who has already had 3 normal laser sessions?Should the laser settings be lower for the R20 than in the previous normal sessions?Should the settings be mantained, reduced or put higher for each passing of the R20 method?Are there any specific guidelines regarding the distance of the laser to the skin? Wich would be the optimal distance?Anything else?