There seems to be some fatal flaws in your analysis:
It's possible. I hope to fix any flaw with the help of the L-F members.
1. The video you have analysed with blue arrows etc is a video made by Steven Krivit.
The video that is linked in the F&P paper has no such blue arrows painted on.
I suspect the blue arrows have been Added by Krivit, and should not be misunderstood as part of the paper.
It's very unlikely that the arrows have been added by Krivit. He posted the video in 2009, but the fashion of the blue arrows (actually a ">" sign) seems to me much older. Anyway, I have already asked (1-2) if any L-F member has more info on the preparation and circulation of this video. I hope someone will provide useful information.
The videos reporting some clips of the 4-cell experiment are very important in order to understand the issue of the misinterpretation of the water level drop in the F&P cells. I hope that the jpeg, that I have just posted, is somehow helpful. It shows that none of the 4 video contains entirely all the others, so all of them should derive from some precursor. It's clear that the original lab video, probably video recorded on a tape, didn't have any arrows superimposed on it, but IMO that kind of video editing could have been available at the time. Consider that F&P had at their disposition the best technology on the market.
2. There is no time stamp in the video linked in the paper, only in Steven Krivits video. Krivits video Should not be confused as part of the official paper. ...
Caption of Figure 10 reports: "(B) The first cell during the final period of boiling dry with the other cells at lower temperatures.". The time on the still (B) is 22:03:58, which lies between the frames with the upper (21:52) and lower (22:18) blue arrows of the video published by Krivit.
The same for Figure 10(C) whose caption says "(C) The last cell during the final boiling period, the other cells having boiled dry" and whose time is 10:43:34. In this case the upper blue arrow in the video is at 10:35 and the lower at 11:10.
So, there is a perfect agreement between the time on the video stills reported in the paper and those superimposed next to the blue arrows in the "Four-cell Boil-off" video.
... And by the way Krivits video show some time after 12:00, not 00:00:00.
The video shows the power-on of the cells at around 11:30 of the first day (April 11, 1992), which started at 00.00.00.
3. F&P topped up the cells at intervalls, and I have found no information in the paper when the last top up occured. But probably it is close or at Boiling point, as in the Lonchampt paper.
In the F&P experiment of 1992, the cells were topped once a day, as shown on each one of the 4 graphs of Figure 6 by the periodic drop of the cell temperature. These temperature excursions allow to easily locate the refills, as shown in a previous jpeg (3).