I don't see any patterns on that...it's just text.
I made a slight modification (simply changed Bit Optimization from "Best" to High"). Also deleted a stray vector that was throwing an error upon file opening. The preview is normally very accurate. However, it is not always going to give you a true preview of the actual outcome on text. You will need to actually carve this to see what it will really look like. (for example, Centerline Text preview seems to always look very "jagged" but will come out nice despite the preview.)
Depending upon the wood, you will likely get a little chipping at locations of the rastered lettering where there is a sharp point. It depends whether the bit is traveling in a conventional or climb direction and how the grain is in the wood itself. So, run a test carve and see if this modified version comes out any better and please let us know the result.