ok, so this is my result
the original circle is now 49mm measured on the x and y axis, and 49.4mm in the 45 degree angles whitout backlash comp.
with backlash comp it is 49.4mm on all dimensions, but i get a small ridge just where the compensation is happening. and i can se the router is jumping right when its making the adjustment.
running the same program twice doesn't change anything.
i have adjusted the steps some from when i first started and used a dial indicator for measuring.
yes this is a hobby machine Openbuilds OX, my cutter is brand new. and i only make 1-2mm deep cuts in mdf right now when i try.
I will try to make a circle in fusion with a very light finnishing pass.