ei and development times for agfapan 100

I am trying agfapan 100, and have done some exposure and development time testing and want to compare results with others. After a couple rolls of agfapan 100, 120 size, I have come up with an ei of 80, developed in Rodinal 1:50, 16 minutes at 70 degrees. Agitated for one minute, then 5 seconds every thiry seconds. Does this sound reasonable? I will shoot a roll or two next week in real world conditions and see how it works. Another question I have is how does agfa pan respond to plus and minus developement? I was going to start with a 20% increase/ decrease in development as a starting point. Is this reasonble? Thanks in advance.

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