Basically, change the rule to something like this:
And give the Klingons and Kestrels their "normal" #2 shield facing values, but also give this one-quarter rule to ships like the Fed CA and Romulan SparrowHawk. (But not to ships which historically have equally thick shields in all facings, like the Romulan King Eagle or Archeo-Tholian CA.)*So long as it has a Shields score above 0, a ship of this class suffering an attack from within its Fore arc will have the number of hits it sustains reduced by one-quarter, rounding up, with the exception of any hits that penetrate the shields. These are treated as normal.
So, as an example, the D7 would go from Shields: 18 to Shields: 22, but only gains an "effective" F arc protection equivalent to 30 - which matches the strength of the #1 shield in FC.
Rather than kill off the rule entirely, this option would lessen its effectiveness to a more proportionate level - but also make it available to each ship and empire that historically warrants it.
