I hope your super mites stay down under. Sorry you have to deal with such tough critters.
Have you tried rotating things a bit?
Say applying DE + soap, then after a few days a synthetic pesticide, then some Neem, then another synthetic pesticide. Sort of a combined shotgun approach to disrupt their life-cycle with all modes of action at your disposal.
And I would second the suggestion to pay close attention to all non-plant hiding spots.
Best of luck eradicating them.
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