George S. Ledyard wrote:
Yamaguchi Sensei said that the amount of force used in a technique should not be more than just the weight of your arms falling on your partner.
Right on right on right on!!!
I would add to that by saying that -in part- this is because it's the "setup" that's most important at the technical level - meaning, if the process leading up to the technique is "correct" then the actual execution of the technique should take almost nothing at all, it is the natural outcome of that process.