Tom thanks for the analysis! After a break from doing my own development I was just going to get back into it. HC110 and D-76 were my developers of choice back when I was doing lots of it. I was thinking of trying pyro, but like any tool I don't think from what I've read that it should be used for all situations. Each developer has it's pluses and minuses but the more tools in the chest the better you can solve problems.
I will be very interested in hearing about your Rodinal tests.