I just got my LaserTile today and gave it a quick try. On my Pro I get gorgeous solid blacks at speed 1000, power 100, focus height 0.290. I did this one at 340 lines per inch and it looks great, but I think I might score the path next time to give it a crisper edge. (Bumping it up to 1355 LPI would probably also get the job done, but I don’t want to think about how many hours that would take! Scoring the outline will probably be just as good and much, much faster.)
This is the 4.25"×4.25" tile in case it makes any difference.