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spiral shank nails

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I have done lots of web research on the list and, and looked thru my new AFPA manuals, and have found zip on spiral shank nails.
In Simpson's catalogs they compare a 10d common and a 8d spiral, and the adjustable shear ratio is 0.83.
10d common vs 10d spiral has an adjustable shear ratio of 1.0.
Seems that spiral shank has an equal shear value of common.
I have a 7d spiral shank installed on a job and am trying to come up with diaphragm values. It has a diam= 0.99" and L=2-1/4". I am trying to compare this to shear values using 6d commons.
Since I have a relatively small shear, seems like they are an equal subsitution, I would be OK even if I had to reduce the value by 0.75.
Please CC me directly if you don't mind: akester(--nospam--at)
Andrew Kester, PE
ADK Structural Engineering, PLLC
Lake Mary, FL
N:Andrew Kester;PE
FN:Andrew Kester, PE