The Mark 1A fire control computer and the Mark 37 radar that controlled the US Navy 5" guns was far more accurate than is represented in game.
thats just not true, the Mk37 (used on DEs, not sure about our fletcher class) had a useful range of ~7500yds and only resolved 3mils. there is no way it could group rounds as close as the AH box, even on an aircraft flying on a constant vector. for a maneuvering aircraft, not a chance of hitting it.
a big improvement to the modelling as I hinted earlier would be to move from a realtime system which depends on speed, Gs etc to a sampled system, which predicts the aircrafts position in a few seconds time (or even in 10-20s time like the very best WWII directors ...)