Mirror tool malfunctions

Hi nice photoshop intelligent people.   I wonder if you can assist.

Ive been playing for a while now with the photoshop mirror/mandala type tool and I kinda like it, its made me discover art that I am actually capable of art. However, it does something I dont understand, well I sort of do, but not enough.

so, lets setup a document, new and shiny, stick on the mirroring tool on radial setting, and .. pick a 1 pt pencil and draw some stuff, now go back to outline it in 2pt pencil.. if you concentrate working on the same segment, look around after doing the outline, often the outline leaves gaps on other segments.. why does it do this??

part of me knows the answer is rounding errors, but, it seems they are recalculated for each segment, rather than actually duplicated around the circle..

it leads to making a mess

Its a shame, that its also limited in  number of repetitions to 10, where as krita does 60 only annoyance with krita is that it doesnt do a pencil like tool that doesnt feather out the colour