Okay have to start this again to add more pics.
It started like a circle and ended like a star! Opps
I think this is the problem, the code has greater than 4 decimal places!! A know issue I believe, but why generate it like that ?
(Generated by PartKam Version 0.05)
G21 G90 G40
(pocket 1)
G0 Z15
T0 M6
G17
M3
G0 X15.810406091370558 Y16.380710659898476
G1 Z-0.8 F254
G3 X16 Y16.098984771573605 I0.8071065989847716 J0.3350253807106599 F1000
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G3 X13.464467005076141 Y18.02030456852792 I2.4137055837563453 J-2.4137055837563453
G3 X13.20304568527919 Y16.715736040609137 I3.1522842639593907 J-1.3071065989847717
G3 X13.464467005076141 Y15.408629441624367 I3.4137055837563453 J0
(profile 2)
G0 Z15
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G1 Z-0.8 F254
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G2 X10.251269035532996 Y32.08375634517766 I8.68781725888325 J-12.784263959390863
G2 X13.269035532994923 Y32.984771573604064 I5.916243654822335 J-14.281725888324871
G2 X16.616751269035532 Y33.30203045685279 I3.347715736040609 J-17.54568527918782
G2 X19.964467005076145 Y32.984771573604064 I0 J-17.86294416243655
G2 X22.98223350253807 Y32.08375634517766 I-2.8959390862944163 J-15.182741116751268
G2 X25.756345177664976 Y30.586294416243653 I-5.916243654822335 J-14.281725888324871
G2 X28.34517766497462 Y28.444162436548226 I-10.040609137055839 J-14.774111675126903
G0 Z15
M5
M30
Most cam packages have a way to cap the number of decimal place to only 4.
So what is an easy way to limit the decimal places?
If I were you, I would check the code posted on the grbl github under Gcode examples.
The code they have is a great deal less bloated than the code you have posted.
https://github.com/grbl/grbl/wiki/G-Code-Examples
Thanks one to try in the morning 
So I have confirmed the issue. Makercam exports many dp’s when using cm’s and only a few dp’s when set to inch’s. So I have downloaded CamBam and have spent all day trying that out. I’ll thinking I’ll try a few ;).
Thanks for all the help and within such a short time frame. Thsnks
I didn’t realize the CAM software you were using was only 2.5D. You might consider trying inkscape. The ability to export Gcode is available.
Grbl v8 can not read code G2 (command I,J) but you can export gcode processing file .txt or.tap and anderson ATC(mm)(*.nc)
Unless I am misunderstanding your comment, the grbl github page says G2, G3 should be understood by v.8 and v.9
I don’t think the Arduino can handle many decimal places. In real terms it is still only a tiny processor.