What surprised me, and I still don't understand it, is that I chose the time for gamma=0.5 which I thought would have given me the level of contrast I was looking for.
Two quick notes.
First, I looked at my data again for the 2:2:100 dilution of Pyrocat-HD with HP5+ and it agrees with the chart in the artilce. For a CI of 0.50 my tests indicate that you need to develop HP5+ for about 6:30 minutes at 72F. This is based on a densitometer reading with the Blue channel and applies to silver gelatin printing.
Second, please note that at another spot in the article I indicated that persons experienced with PMK could correlate that information to the 1:1:100 dilution of Pyrocat-HD by multiplying the PMK time by 0.70. From that I calculate that for normal SBR scenes a time of about 9:00 minutes at 72 F would be about right for HP5+ when developed in Pyrocat -HD 1:1:100.
Hope this information is useful to you.