Came up with this after some googling and experimenting:
Slice Test_kr2.gh (107.5 KB)
It seems that the G03 command starts the arc at current position and ends at the point (X, Y, Z points) you supply (look at your previous attempts, the first arc is drawn from the 0,0,0 position to the first coordinate you supplied). You need to supply some move commands (G0) and it seems more reliable to make the circles in 2 segments.
Move → First Half Of Circle → Second Half Of Circle → Repeat
No guarantees on the accuracy of this, just what I’ve figured out from searching and experimenting a bit. Seems like a pretty complex topic.
-Kevin