When I drew this up, the central hole was too small to be cut w/ the endmill you are using. Similarly, the finer / sharper features of the interior can’t be cut either. That said, here’s a quick version which ought to work — please check / adjust the feeds and speeds and other values.
sampledesign.c2d (181.3 KB)
My suggestion would be to use a V-engraving pass to at least begin to cut all the details, then finish w/ the flat endmill, then clean up as needed w/ some triangle files.