Pulled TMY to 100; reduce by how much in development?

I mistakenly pulled a roll of TMY 120 by 2 stops (after compensating already by 1/2-1 stop...). I know how sensitive TMY is to development errors, so I would like to know what kind of % you recommend in reduction of the time. There are a lot of white T-shirt shots and I don't want to lose the highlights. I develop in PMK pyro, and use 80deg. as my standard. Thanks all. shawn

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