Here is what I changed and why:

• The source (or image the brush uses) is a harder edged circle. The tech pen had a slightly softer edge which looked blurry at larger sizes.
• It’s also a larger/wider brush. I like a lot of variation in line weight. When Inking I like to set my size and not tweak it much. This can take some getting used to and it might feel like it’s blowing out to fast as you apply pressure, that’s the way I like it.
• I changed the streamlining. Streamlining smooths your strokes and makes them less jittery. The Wiggly has streamlining turned off, this is good for detail work, hatching or quick lines. The Fat brush has streamlining cranked up, it’s great for outlines and slower strokes.