ok. so i went for it today. i took one of the pens i did that the finish failed and sanded the tip. i started with the set up in the first picture to remove the 'bump' on the bottom. then i switched to sanding freehand making sure to keep the pen as vertical as possible and not moving my wrist but pivoting my arm. i started with a 600 grit which in this case is more like a 500 if there is such a thing. then when i was happy with the shape i moved to wet sanding on a different 600. sounds strange but it would be like 600 and 800. testing as i went by dipping so i wouldn't have to fill and empty the pen. i finished of on a brown paper bag. came across that somewhere. seemed to work good for finishing.
i'm happy with the results. now to practice my penmanship.