Holdown Shim Fastening

[WAstruc10]

When a shearwall endpost holdown which utilizes SDS screws is misaligned by one stud's width, so a short piece of 2x6 shim is needed, do you think it would be acceptable to simply lengthen the SDS screws by 1.5" and assume that the shim is now acting as an integral part of the endpost? Or do I really need to add extra fasteners (in addition to those used in the holdown) between the shim 2x6 and the continuous endpost studs? And to take the theoretical question one step further, what about for a through-bolted holdown? The latter would seem to allow shim slippage, while the bolts are subjected to undesirable bending, but for some reason having the SDS screws through all the plies feels better, even though I think the theory should be the same. It seems pretty conservative to have 20 SDS screws in a holdown and then require 20 more, located above the holdown, just to make the shim integral...but maybe that's what it takes? Thanks for your input.