ohhhh boy,where to start.
If your going to furball in a A-20 go light 25% fuel (yeah i know only 15 min flight time) 9 times out of 10 you will get gang raped before you run out of fuel anyways
but that is part of the fun.
everyone has their own style of fighting so you will just have to play with it. personally I like to stall fight in the vertical with 09s, rolling scissors works well with spits and f6f.
between 200-275 you can turn with just about any ride in game for the first turn and a half,so make your shot quick and move on.
if you have rudder peddles, take advantage of the A-20s rudder, it is sweet
force overshoots is another tactic that works well,perticurly with the run90s/p47/p51
if you give it a chance and fly it enuff you will learn all its good points and the bad ones[part shedding at high speed mainly]
best place to dogfight/furball is MW it has the best matched plane set.
if you ever want to wing up just yell, i,m usually online in the evening 8 -11 est would be happy to help out.
its late and I know I have more to share but the only thought for me is sleep