Thanks, so the way I ended up doing it is making a custom status that deals damage when it is applied, seems that the damage it deals is based on my level and I can't change that.
I just wish there was a way to apply a status to myself that buffs my damage for only that single skill when I use it on the enemy with the status, but it seems like TARGET:IF(HasStatus:KNOCKED_DOWN):SELF:OnHit:DamageBoost wouldn't work and you can only apply the status to the target which kinda sucks.