Derrek,
That is a great video! Thanks for taking the time and effort to post it. Dust is a big deal for me and I work hard at minimizing it in our shop. It is a serious concern for a lot of operators out there and I am not the only one thinking hard on it. This data also correlates very well with what I experience in my environment.
Like you mentioned, different setups will vary the results some. I don't use common line. With my own setup I actually have a little more of a differential between onion skinning and single pass due to the fact that I cut relatively smaller and so more densely packed base cabinet rails , nailers and drawer parts on the cnc yielding more small parts that of course take even more time on the second pass. Some of these parts would require onion skinning even without the dust issue. I Also depending on the material I use a feed rate of about 720 to 830 IPM for a feed rate. It looks like you may be moving even faster than that, but it is hard to guess from a video. 3 flute tooling would make your feed closer to 1100 IPM.
That all being said it is still a small proportion of overall time for me to onion skin due to the fact that between drilling, dadoing and perimeter cuts my total sheet time is closer to 12 minutes, including drilling with a drill block, dados an occasional saw cut, onion skining perimeters and sheet change time.
I am pretty comfortable at 35 sheets a day or so. The onion skin costs me overall between 1 minute and 2-1/2 minutes out of that 12 depending on the mix of parts for a normal average sheet.