You got it right.
Leme take a quick look at my spreadsheet notes
edit:
yes that agrees with the measurements I've made as well the various articles.
If you've seen the video
@yellow rose posted, it shows how the time used for electronic switching steals a degree or so every 1000 rpm. We really only see this after the weights hit the top of the slot. I only mention it as one of several reasons that the stamped number is not absolute.