This is a great knot for tying a fluorocarbon leader to braid. If tied well, it has excellent strength and it’s small profile allows it to easily pass through guides.
When tying fine diameter lines I personally find I get a better knot if I use a light-to-moderate tension on the line for the first half of the knot. I also use plenty of wraps for lighter line. Ultimately I want the knot length around 15 to 20mm in length.
Here is an excellent video by Jason Ehrlich using the same technique I use.