It's not a matter of how hard they hit fighters.
It's a problem with the inconsistencies in how Hitech has described the system "should" work vs how it "really" works (compare bombers vs fighters, he describes it SHOULD theoretically hit them many times over, but in fact they are all but untouched, whilst faster manuvering fighters get the majority of lethal hits)
THAT, to me, is the key issue. Bombers skate through at 10k unharmed after multiple passes, whereas a fighter pulling 6 Gs twisting and turning while diving from 27k to 20k and takes multiple hits, eventually being killed.