I think there's a small bug with the passives of the Captain Carter mod.
When you add one point to her first passive 'Shield Mastery', it always shows (-100% damage), no matter what. So, powers like Shield Throw, Shield Uppercut, Sharp Edge and Charging Star, they always does the minimum damage (or no damage at all) once you purchase the first point of that passive. If you buy more points for it, you always get the same result (-100% damage).
Also, the 'Health Regen' passive is always set to 0% (no matter how much points you buy for it).
I tried to add a second skin, and I got the same problem: 'Shield Mastery' is always set to (-100%) once you purchase the first point. And the passive 'Damage Reflect' of that second skin i added, is always set to 0%, it doesn't matter how much points you buy for it.