starship sensors only affects the anti stealth part of fire on my mark...the dmg debuff is uneffected. There is nothing that can increase the dmg debuff.
personally i think that only for the resistance to Confuse and Placate effects it is a too expensive skill to invest into. PVP players may want to put 3 points into it, but even there it is questionable. Stealth detection is useless anyway, also only valid for PVP and not even sure about that.