I defer to your greater experience, Richard, and based my comment on long experience with the cassttes I made thousands of duplication masters on back in the day.
I would only quible that the TASCAM chart is not the last authority, and would be willing to bet (handshake only) that the original mono cassette spec has a track that is wider than the stereo head path, from my experience in the past with hissy right channels on cassettes made on mono machines. That is, at this point, anecdotal and historic, and possibly incorrect as to the actual track widths.
But this may be irrelevant to getting good transfers from old cassettes, though I find the left channel is quieter if no edge damage occurs.