The project I had to do was really small so I did not mess with any other variances. The 160,70,1 pass worked just as deirderbeth said. I had to run a X-acto knife to cut some of the center ridges but I never had any fire. I did keep a wet cloth and water next to me the whole time and never took my eye off it. I am sure if you did mess with the speed, power, or number of passes you could get a perfect result I just didn’t really want to spend the time to do so as of right now. But I bet if you just did a second pass it would make it all the way through.
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