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I crack.

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I am working on a 20 story with concrete shear walls. for calculation of Ieff we use formula (9-8)(318/318/R-103) of ACI. which needs calculation of Icrack.
Icrack is again a function of steel reinforcement in the section (which is not known before analysis) and I think practically it is almost impossible to calculate it for each section at each story with lots of trial and errors. I have been advised to use [ Icrack=(0.35 - 0.5) x Igross ] that I don't feel comfortable with it.
Any experience or advise on that would be really appreciated.
Alex M,PE