I believe that a small feature to the personal weapon be implemented to supplement the abilities of boarding parties on larger ships. This feature would allow personal weapons to completely or almost completely bypass shields when firing on the ship core (and only the ship core) if the mass of the ship is above a certain value (say 300 or 400). However the personal weapon would NOT be allowed to cause a ship core overheat, it would only allow the untimely death of the ships pilot. This mechanic would encourage the useful placement of a ships core rather than just anywhere near the back of the ship for larger ships but would not penalise smaller ships like fighters from having exposed cores.