I’m not sure what you mean by shadow for each letter. It takes the distance from the letters. You may want to either use a smaller outline or divide by a higher number.
As for having an outline… yeah, that’s easy to do.
I modified the graph. The original one worked in pixel size, so the shadow would change as you zoomed in and out (or different resolutions). Here’s one that works on EM’s instead.
You’ll have to play around with the OutlineSizeEM for the outline. It’s VERY finicky. That value was for a font size of 20. You’ll have to adjust it carefully to suit your needs.
Result:
