Originally Posted by
dabac
Don't bother trying. Damon Rinard did some decent testing on spoke tension vs wheel stiffness. Basically spoke tension doesn't effect a wheel's stiffness unless spokes currently are going slack while riding.
+1, You took the works right off of my fingertips.
Unless the wheels were poorly built and seriously loose, changing the tension won't change the character of the wheels. If these are decent wheels save them for the right events, or sell them to someone lighter who'll benefit from their greater flexibility.