It seems to me that Impact Mitigation's "engines and weapons take half damage" line is getting ignored, here, as is Resistant Flux Conduit's EMP protection. 2400 effective HP is enough to shrug off any Salamander that isn't rocking Elite Target Analysis, and that's the frigates.
Depending on which frigates you run, maybe you're not putting one or the other of those on them, but bluntly I've killed a lot of frigates 'cause their engines died, no Salamanders involved. The ships that most depend on their speed and maneuverability to survive really can't afford to lose it.