When I read that a race's luck value determines the minimum damage any weapon can do, it occured to me that instyead of luck determining the minimum damage, a "Weapons Targeting" race ability could do that.
Taking the idea further, you could have a tech branch under space weapons that gives you weapons targeting components to add to your ships, each of which adds a set percentage to the minimum rolls a ship may make in combat.
If you want to get crazier, you could have a similar line of techs down the defenses tree called "Targetting disruption" (with the corresponding race ability) which gives you components that counteract the effects of weapons targeting to an extent. The line of techs could have things like "sensor jammers" and "sensor ghosts".
Instead of being down the space militarization branch, targeting and disruption techs could be offshoots of Sensors I, and flesh that branch out a bit.
Thoughts?