I agree with Long Lance - leave it as it is, and concentrate on other things. It's a bit absrtacted search system but I think it produces realistic results overall.
You are all under impression of what you DO see, but many TFs remain undetected (so you obviously can't comment on them).
In my game with Leo (that prompted him to post here and start and bump this thread

I have 100+ planes on search, I search like crazy - Hudsons, Catalinas on 80-100% search and patrol, Mitchells and Marauders on up to 50%. Hudsons having 80-90% experience and very high morale. In so far (2,5 months of game) I lost cca 50 Catalinas most of them to operational losses!
He tries to run barge TFs in front of my nose and I guess the results of all this are quite realistic - sorry Leo, just my humble opinion.
Leave it as it is.
O.