Okay so after looking at it for a bit, Victor's dual wield plugin is doing something weird with dual wield attacks that seems to prevent any kind of MP gains from happening when one is used. I can't even force dual wielded attacks to give the actor MP via gainMp in the damage formula box with my own plugin disabled. Also, I tried replacing the attack, with no luck. Any attack that goes off twice via the dual wield from that plugin is going to have this problem, unfortunately. And no, replace attack happens when the actor command window is built by injecting the specified skill id in place of normal attack (1). The only thing I can really think of is to (assuming he's reachable) contact the creator of that plugin and let him know that you can't force actors to gain MP via the formula box when using dual wielded attacks.