I feel like this is a complicated question, and one's answer to it may change depending what sort of stage/mood they're in. I've even studied under someone who changed the way they determined the initial tension years down the line. It's something I think about a lot, though, because I think it's a very important part of the initial setup, and I would really like to get to a point where I can more or less do it smoothly and evenly, especially in a performance environment.
So, how does everyone prefer to determine the initial tension with mune-nawa? I provided some examples, and I think each has a pro and con. It feel like visual beauty and functional beauty are tough to balance with this particular tie.
I personally use more the wrap back method as Milla mentioned but as you all said especially depends on the person you tie and how they feel more confortable with.