Guess what!!?? In RL, huge battleships used to be kings of the oceans until a few planes demonstrated that they could drop some bombs/torpedoes on it and sink it with relative ease. This revolutionized naval warfare and led to the development of the aircraft carrier and the carrier group. Why should this aspect of the game be so dramatically different because it's in space? (Didnt we have this discussion before?)
IMO, perhaps a better alternative for adjusting BSes would be something like:
1) give BS the longest reaching guns to compensate for lack of maneuverability
2) give BS more gun slots so they can dedicate more of them to anti snub weapons and make them less vulnerable
3) make BS anti-snub weapons more dangerous - increase refire rate, damage, distance
I would rather something along one of these lines is done rather than making the hulls/shields stronger.