What about changing Hawk Eye's damage formula, or keeping it but splitting off Oil + Poison into another skill? A big issue with it is that the unit is doing comparable damage to decent PA attacks, but also going more often (after the slower mages who benefit from oil, as well) and applying debuffs. Maybe one skill based on SP*WP and another, weaker one for the debuffs? If the status part got split off into its own spell Hawk's Eye could even get a damage increase.