Response to changing minimum variables for finer grain & acutance

Another alternative is that there's absolutely nothing wrong with your processing technique at all, and it's the film that's at fault.
All film has to go through a 'ripening' stage, which critically affects the grain structure. The majority of this ripening is done during manufacture, by storing the raw film for a time at a controlled temperature, but ripening continues until the film is processed.
Incorrect storage, at high temperatures or humidities can drastically affect the grain of a film

Do you buy your film in batches and keep it refrigerated?
If you buy on a piecemeal basis, then you must expect some variation, however consistent your processing is.

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