@pentaxuser - further dilution reduces the strong adjacency effects (Ilford use words to the effect of 'less optimal image quality') which are engineered-in to the developer to ensure at least equal sharpness to dead standstill conditions, but allowing for sufficient agitation to get truly even development. None of this is new or earth shattering information
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{moderator redaction in the interests of site harmony}
In other words, anything less than sufficient agitation for properly even development (and this can be seen by the MK.1 human eyeball, never mind a densitometer) is a bad idea. End of story.