As I was saying, I would be glad if someone could record some footage. Quite some time ago I was testing damage values with some HRE member and even then we were able to get about 7 ghost arrows in a row. But then again, what will that change ? Everyone playing ranged for more than a generation knows that there are ghostarrows and that it happens all day everyday. How would it help to see it in a video ?
It seems totally random. There is no "formular" as far as I can tell that makes arrows ghosting. Sometimes a perfectly fine placed shot goes through a single enemy or even a whole bunch of them. Sometimes everything is fine.