Problem is there are a few cruisers that turn reasonably fast to e-kill turn around and fire missiles just as you hit the thruster towards the enemy.
Flying backwards on e-kill and shooting missiles don't work extremely well, but it still keeps the bombers/fighters busy dodging.
The BS missiles was just an almost random number. Point was that BS can't e-kill turn and thrust + fire missiles. Which means they are less effective and a speed increase might be in place.
EDIT: Also while GBs are meant as anti-fighter/bomber. Cruisers and BS are not meant for that.
Igiss says: Martin, you give them a finger, they bite off your arm.