That sounds like a separate issue - can you clarify what you mean when you say you get lines? Do you mean the laser is marking where it shouldn’t, or you’re seeing darker lines in certain areas? The latter could be due to overlap between splits, which is another setting you can adjust. Overlapping can be helpful to prevent gaps, but you’ll have a lot of overlap if your splits are small and your overlap is not accordingly small.
As an aside, there’s a good chance .01 is lower than the smallest possible split size (object circumference / steps per rotation) for the object you’re engraving, although LightBurn will inform you of this in the Rotary Marking window.