The Luftwaffe used HO attacks on bomber formations because they were exposed to defensive fire for shorter periods of time and because they could get a better shot on the cockpit of the bombers. Remember that at this stage of the war the LW was concerned not only with shooting down bombers, but also with maintaining a sustainable loss rate. We all know (or should) how suicidal it is to approach bombers from the aft quarter when a reasonable gunner is aiming back at you.
The problem of the spit16 and la7 is that they are both overbalanced for the main arena, and thus they become crutches for pilots who have a lot more to learn. In unskilled hands they can still be shot down, but even in mediocer hands they are potent. Both are faster than just about anything else, and both turn and climb at insane rates. I'm not sure if this performance is historical for these models or not, but lets assume they are.
The devs put the perk system in the game to help even things out, and so more advanced aircraft could be included without having the sky full of 262s all the time. I see no reason whatsoever why the f4u1c should be perked and not these planes. Actually I think the spit 16 and la7 should be perked way higher than the charlie.
In real life, war was about winning. This is a game. There should be balance. The La7s and spit16s throw off any kind of balance in the game, unless we all just 'join them' as someone said. I see this as a cop out. Any time I participate in an attack, almost all I see upping to defend are spit16s and la7s.
I'm not saying that they should be taken out of the game, or even heavily perked, but I think it would be beneficial to the game balance and the sense of emmersion to perk them around 20-25 points each.
If we don't perk them, then people have no real incentive to fly anything else. Leaving things as is allows people to mask a lack of skill by flying an (almost) absolutely superior performing aircraft.
Perk these planes and people will be forced to learn how to fly them right, and will be forced to think twice about taking them up. We'll also see a much greater variety of aircraft being flown in the MA. Wouldn't we all (except the potatos who perpetually fly these types) benefit from that?