I use a Taut line hitch quite a bit. I have a sailing background, and the Taut line is an essential knot to know.
The Taut line is a great knot and pretty simple to tie. I usually tie it with a 'slippery hitch' so that it can be untied quickly. I don't know that the Taut line hitch needs improving; it's a great knot and it works! But the Arrowhead sure looks intriguing and worth testing.
Thanks for the reference!