I will argue that the best "Deacker" doesn't need great guns.
Personally I use the FW190F8 with 12 rickets and one bomb. Bomb on radar and rockets on ack. The old maps I could hit the auto guns in 2 passes. New maps it takes 3(trying to figure it out). Upon deack complete you will have a good amount of cannon left for anything from troops to fuel.
Best pork run was all auto/man gun down, dar down, and ord down. All auto includes town ack.
I feel 262s aren't good at attacking buffs. From a gunner side they are one of the easiest planes to hit. Yes they can explode planes pretty easy but they aren't good at taking a beating. I would use a 190.
Mossy easily has best gun/ views in game. Fighter on Fighter its the best for making the shot, not so much getting position for the shot.
Il2 best guns for sure but sense they needed the F3(Thank You HTC) I'd say the Stuka is best observer/tank killer. A20 being the best overall but we aren't talking about bombs here.