Unless you spend 15 minutes sanding, it's not like you can do any damage with the micron lapping film. The sweet spot is only small if it is in the wrong place for you, so go ahead and adjust it to fit you. Figure 8s are fine, but don't do them in one spot. You need it to be rounded, not all flattened in one spot, so start doing figure 8s with the pen a rotated a bit more counter clockwise than you normally write, and keep rotating the pen as you do them and don't stop until you are rotated more clockwise then you right. I do the most number of figure 8s in my actual writing position, but you still need to do some in other positions to keep the tip round. Also you don't want to create a flatspot going front to back either, so slide the nib back and forth a bit while starting with it slightly flatter than you write and finishing with it more upright than you write.
If you do figure 8s too much or with too much pressure, you will get a problem called baby's bottom - where the pen is very smooth but hard to start writing because the insides of the tips of the tines have become too rounded. To fix this you can just move the pen across the lapping film side to side a bit to flatten it out (basically, you want round to be smooth, but too round is a problem). Use the 1 micron film to make changes to the shape, the 0.3 micron just does the final smoothing to make it feel very smooth when you write. I have smoothed all of my nibs, except my Pelikans. My Pelikans only needed tine adjustment, but they were very smooth once that was done.
This is a good link to read, especially for the pictures: http://www.richardsp...kshop_notes.pdf
Edited by marlinspike, 03 March 2018 - 21:47.