Carrick, in the BE I favour getting down on the deck when being attacked by Eindeckers. Your observer has no downward field of fire anyway so force your attacker to be above you or underground.
You likely wont shoot him down, but he might make a mistake and spin in with no room to recover. Or get tired and go away. I'm happy with either result in a Quirk
Does flying upside down confuse the Boche at all?
"Take the cylinder out of my kidneys, The connecting rod out of my brain, my brain, From out of my arse take the camshaft, And assemble the engine again."