Robert, not to argue with you, but why would you suggest more fasteners?
There is no way you are going to keep a truss from moving with a few nails or other fasteners, the science behind the phenomenon says it is going to move or break in the process. Securely fastening the truss to the top plate just means the truss will lift the entire wall. The truss is designed (over designed usually) to account for wind, snow, and all other loads; fastening it to a few measly 2x4's and Sheetrock is not going to stop anything.
Unless I missed something, more insulation and ventilation is going to promote uplift, not lessen the effect. It is the difference in the temperature and humidity between the top and bottom chord that creates the phenomenon. If you want to stop the movement, take out the insulation and allow the top and bottom chord to be the same temperature and humidity level.

Creating a slip joint effect as previously outlined is the accepted fix.
Jim

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002