The information in the stat screen is most likely incorrect. Aim for fess works as if it was strength adding bonuses to his attacks and damage. Unfortunatly with him being an Aim stacker, techblade upgrades with Aim come few and far between. i have only found them as rewards from side quests making his progress reliant on completing quests that will grant a companion weapon reward and with the lack of finding an orange weapon for him he gets stuck with the same weapon for many levels