Depends on your weapon's TEC stat, really. If it's too low, %s aren't as useful. Look at the technique's TEC mod in game, choose an arbitrary value for the enemy MND, then do the math. The damage formula at the bottom of this page will work for that too.
EDIT: You'll need to keep in mind what kind of weapon you're using, since empower bonuses vary depending on weapon. Don't forget taking into account the % bonus from linked techs.
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