Scorching happens at virtually any setting, after all we are cutting a flammable material with a laser! But the slower the laser moves, the more time the heat of the laser has to cause soot to collect on the board. We want to use the fastest laser movement that will still cut through the material. We have tested settings and our overall recommendations have worked well on our Glowforge basic. In addition be sure your air assist fan is clean and working well. It is located at the back of the printer head and blows air over the cut location to prevent flammable material from staying in the laser path which can cause a flam. Here is a link to the cleaning instructions.