I can certainly relate to the long tail issue Tobus, especially when wearing the kilt. I'm 6' tall and wear a 17" neck and still have that problem a lot.

I also use the Half Windsor, but my understanding of the different knots is not so much a matter of formality but of the collar spread on the specific shirt. A full Windsor, being wider, sometimes doesn't fit well in the space provided and forces the collar to bunch up. And a Half Windsor may look to be too narrow in ones with a wide spread.

At least that's my understanding of it.