Problem Engraving the Letter O or circles

Hello Openbuilds!

I am in need of some higher level brain-power as I have run out of some a long time ago...

Machine Specifications:
OpenBuilds extrusions (500mm x 500mm)
V wheels for linear motion
ACME lead screw for z axis
(Basically, an ox/shapeoko/x-carve hybrid)

CAD/CAM software:
Fusion360

G-Code Sender (What I've tried so far):
UGS
BCNC
GPANEL
(My arduino runs 0.9J GRBL)

I am trying to make a project box out of pine wood, but happen to be stuck with engraving - more specifically...

Problem Engraving the Letter O or circles