Diafine: Tri-x @ 1000-1600. Is this a joke?

So, I've done some exposure tests from 400-1600, developed them for 3, 4 and 5 minutes each and if shadow detail tells the story of film speed then I'd say 400 looks pretty good. What I can say about 1000-1600 is that high values don't block up at 3min and grain is still tight and sharp; 4 and 5 look over-develeped. I must be missing something. I sure would like to find something that would goose Tri-x a couple stops with shadow detail.

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