A8 with 4X20mm if the target is below 20k.
It's extra armored compared with the A5, and also have 13mm mg's.
Always HO the a 3-plane buff from 10 or 2 oclock, with low speed, you will be able to down 2 buffs in the HO, and fly home with a smoking engine killing the last one from it's 6.
Lancasters at lower altitude can be dealt with in one pass, however at higher altitude (26-30k), they both outturn you and outclimb you with ease.
The A8 buff nemisis is the A20, that both outturn you and will kill you in a turning battle with its gunners with bombs onboard (!) flying in a 3g turn (which of course is nosense).
Also beware of the B26, it is able soak up more damage than any other plane in the game, you will be lucky to kill one and damage another before your engine die from damage.
The A8 is useless in a fighter vs fighter against an experienced pilot typically found in main arena, after they introduced AWACS radar im the arenas.
Almost everything in the sky can outturn you and is also faster, though if you come in at 14k with 300mph nothing can catch you coalt in a near-600mph dive (not even the 262). it is also the best 262 killer in the game if you have speed and alt.
When I was active i set my convergence to 600 yards.
