I just think that the current leathality of the buffs guns a tad high, engine hits should be less frequent with a ring of 5.5mm-6.5mm armour around the front cowling combined with 4mm and 20mm armour around the cannons with almost a solid bathtub type protection of 5mm armour plating with 50mm bullet proof glass would make attacking a buff a little fairer especially for using a dead 6 of HO attack as used by the Sturmgruppe. The Mk108 is pretty much a short range weapon for any kind of accuracy, pilots were told not to open fire until 100 yards and the current buff guns give no chance to get close to use them.
"During the advance each man picked a bomber and closed in on it. As our formation moved forwards the American bombers would, of course, let fly at us with everything they had. I can remember the sky being almost alive with tracer. With strict orders to withhold our fire until the leader opened up, we could only grit our teeth and press ahead. Infact, however, with the extra armour, surprisingly few of our aircraft were knocked down by the bomber's return fire. Like the armoured knights of the middle ages, we were well protected."
Leutnant Walther Hagenah