Thanks for the video. I am a new stringer and an owner of x-2 as well. I had some very similar experience as illustrated in your video thus have the following question for everybody:
When pulling a main, he set the tension bar to horizontal. However as soon as he unclamped the previous main, the tension bar dropped further below. This occurred several times and some drops were quite significant. This happened to me as well. In my case, I would put the clamp back on to the previous main and re-pull tension. Is this necessary or I can just move on like the OP did?