Ah... That sounds like the 'Erratic Player' skill in Mystery Dungeon, and a great idea at that too!
Guessing from the name, I kinda get why the SE-attacks would do more damage, but I don't get how that lowers the damage from NVE-attacks?
You cloud always try another name like: 'Erratic', 'Inconsistency' or 'Play Tough'...
You can do whatever fits your shoe.