Film with longest straight-line curve for extreme pulling

Can anybody advice the film suitable for extreme pulling, that has very long straight-line part of characteristic curve? I realize that speed and contrast both drop while pulling – both effects are desired; the acceptable speed should be somewhere in 6-25 ISO, the contrast (gamma) somewhere in 0.35-0.45. The subject brightness range is ca. 9 stops from important shadows to important highlights; to have 1-2 extra stops as a safety margin before noticeable shoulder would be great.

I have access to most Kodak/Ilford/Agfa films, excluding TechPan and discontinued APX25. In any case I'll do my own testing, (the first candidates are Ilford Pan 50, D100, FP-4+) but I'll appreciate if somebody gives me some guidelines.

The grain doesn't matter.

Thank you! Andrey.

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