1 Player hardcore
Hm, I'm a bit dubious about this strategy, at least for the stated reason. Enemy aircraft are hugely random, you usually have very little idea if a MiG-25 or Su-27 will even appear, much less it's location. The only information you have for potential bandits will be obtained by examining the backsides of the sites you have drawn and placed.
That is why I try to always pack a couple of AIM-120s or Phoenix missiles.
Seconded. Splitting up your forces still doesn't prepare you for Su-27, MiG-25, or MiG-29 draws in the center. You'll need something with longer range than AIM-7s or AIM-9s.
Plus, splitting your aircraft may force some aircraft to fly over threatening sites which can otherwise be avoided.