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Firstly, any game lag will affect your deflection and there is little you can do about that. Secondly, firing whilst your plane is climbing ot diving, will affect your ordinance trajectory and will fire in an arc. If you are unsure, aim ahead and hold steady whilst your opponent flies into your guns. Short burts with guns that have significan recoil is better than long prolonged burts.

Unfortunately, there is no precise information regards the convergence of wing mounted guns in BOP. The default in IL2 (from which the flight modelling was taken) is 500m which is pretty high.

Distance of an ac in your sights is determined by the size of the ac in your sight ring. A Bf109 that is wing tip to wing tip in the circular sights of all UK fighters is approx. 100ft away. If the BF109 is wingtip to wingtip from the centre of your gunsights to the outer circle it is then approx. 200ft away. This was used by the pilot to gauge the deflection needed and the optimum firing point for the convergence of his guns. During the Battle of Britain, convergence was set to 200ft. A Heinkell that was wingtip to wingtip in his sight was 200ft away as it had approx. twice the wingspan of a BF109. Deflection is one of the most important skills but also relies on knowing the distance of enemy ac and the convergence of hs guns for maximum effect.