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SDPWS 4.3.2.2 calls for the unit shear value v in the three-term deflection equation 4.3-1 to be divided by the unblocked factor Cub. Equations 4.3.2.2-1,2 show that this is equivalent to dividing the first two terms in the equation (bending and combined shear/nail slip) by Cub.
When using the more accurate 4-term equation from C4.3.2-1, so the program divides the first 3 terms of the equation (bending, shear, and nail slip) by Cub. This is the equivalent procedure to that prescribed for the 3-term equation.
Since SDPWS Commentary equations C 4.3.2.2.-1 and -2 indicate that it should be considered a stiffness-reducing factor, Shearwalls multiplies the deflection due to non-linear nail slip by Cub, rather than applying it to the shear force v before it is raised to a power in the determination of en.
Cub is not applied to the overturning force used to calculate the hold-down displacement component of deflection, i.e, the final term in the equations.