I compare an F-5 more with an artillery grenade than a Savannah Master.
How much survivability do those 5 points actually provide? I mean, when an F-5 gets intercepted, it's toast most of the time anyway. Their protection comes from numbers, and the fact that they are out of the fight after one salvo, while there are probably other, more important targets still around. When an F-5 gets in range, simultaneous fire guarantees it gets off its single salvo, and then it's only a distraction (barring ramming attacks).
So at least in tactical games maybe another RL10 that helps to eliminate a target faster actually saves some more of the F-5 swarm than a point or two of armor...