For the first screengrab (2Dmilling), I meant to say; try with the option "Convert Curves to Arc and Line" checked and see if you get IJK arc motions when postprocessing the program (see attached).
If for some reason you can't get those IJK Arcs motions to output (G2/G3), and therefore limited to linear motions only (G1), then your idea of increasing the number of points onto the model itself to 10k is not a bad idea.
(G2/G3) Arc motions
(G0/G1) Linear motions