To get this toolpath to run correctly, without witness marks, you will need to experiment with the cut depth used.
Making sure you have an accurate and repeatable way to establish your z height to the top of the material is critical. If you are using a touch probe, make sure you use digital calipers to verify that the block dimensions match the machines program. On a OneFinity CNC this can be adjusted in the settings as seen below. Make sure to click the save button on the top left before leaving the screen.
I use the Amana 56125, which is a 1/8" Radius Point Round over. This bit has a small point, but I have found it surprisingly strong. I will note that I only use this bit as the final toolpath. I do this to limit the amount of material it removes.
Use a scrap piece to make sample cuts with this bit starting at .120 and moving up to .130 cut depth. Take note of the depth that gives an even radius. On the Onefinity Journeyman 48x32, I have found with an accurate z position that .128 gives an even radius without grooves. Keep in mind that the bit was created as a v-bit and will move away from the line horizontally as you make a deeper cut. Finding the balance in the middle is the goal.
It is much easier to lightly sand a cut that is too shallow, than it is to sand out the sharp ridge if you go too deep.
I run this bit at 40ipm mostly and 30ipm in hard maple using a climb cut