Issue with first acrylic cut

Hi,
I attempted first cut of 3mm Acrylic sheet with Atomstack X20 Pro. The material was cut ok but there are rugged/burred edges on the bottom side of the cut piece. I am looking for some guidance to fix. ie. Do I need to speed up or slow down, increase or decrease power or increase lowerr the air supply? Any starting parameter suggestions and how to tweak them to get good cut would be much appreciated. Thanks