Just a quick observation in the naming. The names feel Imperial. Rebels and Imps are differentiated by their uniqueness. Rebels are named (mostly) and we see their faces and emotions. They are folk we can relate to. The Imps are faceless and nameless (makes it easier to gun them down in movies). The few exceptions (outside of named villians) are names like 'Howlrunner', ' Backstabber', etc.
I would either :
a) make up names. Eg. Barry McKenzie
b) make up names to go with the nickname. Eg. Barry "Fearless" McKenzie
c) give them a callsign. Eg Gold 7,
d) give them their own squadron and 'rank'. Eg. Rapier squadron veteran
I think this is more fitting to the canon and the FFG standard naming convention.
Cards look great by the way and I really .. REALLY .. love what you're doing with the astros!
what i feel too