Response to Alternative to Xtol

Isn't the EI (and therefore the film speed) the point where you get .1 over film base + fog for a zone I negative? I know I am testing lots of different films now and all are coming is slow, slow, slow. Heck, in rodinal 1:50 neopan 1600 came it at EI 160! The only film I've found so far with any speed is TMZ which was EI 800 in emofin.
Anyway, I am interested in the argument here because if I cannot infulence the real film speed with the developer then that changes my search for a good film/developer combo...

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