I like the quasi-capital ship idea from turbolasers. Say:
Proton Rockets:
Attack - 6
Range - 2-3
Spend a target lock to use this card. Small base ships gain + 4 agility, large base ships +2, and unmodified focus results cancel hits as well. Capital ships are affected as normal. Then discard this card.
Proton Bombs
Attack - 6
Range - 1
Only capital ships may be targeted with this weapon.