I agree with what the others said.

I don't like the idea of leaving it long and serving the ends to the string for two reasons:

One -it adds more weight to the string which will slow you down. It's only a little, but when you have a short dl like me, every little bit helps.

Two - there is much more potention for the loop to lengthen. A loop tied as described above will stretch as much as 1/4". Even though I use a large set of needle nose plyers to put a lot of tightening pressure on the knot to start with, I still get stretch. Leaving the ends long seems like it would be even worse.