follow up - got some better behaviour out of the single de-P filter today.
Grinder set on 5 choked it.
Grinder set on 6, slightly less fill than I normally do (tamped maybe 1-2mm below the top of the filter), and it trickled black gold.

And thanks for all your input, even those who havent replied directly but who have offered advice in all the other threads on this forum.

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