some tools are forged, and some are milled. Either way, the inside faces of the vee have to be smooth, or the tool is junk.
I have thought of cleaning up the inside of the veee, but it could be a time consuming process. If you had a brass or hardwood lap, you could work out minor rougness, but this won't take out major pits. maybe a shaped Cratex wheel would do the trick, bu the wheel would cost more than a new parting tool.
On an old high carbon tool, you could anneal it, and file and stone the inside smooth again.
This is one way to eat up a day.
Acer