Kazaa's gunnery rundown.
1: Setting my mouse/stick just right. I make sure I have enough scaling to make that smooth transition through the band.
2: The gun sight I use is key for me, I currently use the default one but scaled down to give myself better reference to the horizontal and vertical axis.
3: Don't always pull lead on the target unless you have full view of him. If he's under your nose then I will always pull/shoot/release to see where my tracers are going and repeat if missed. Most of the time the 1st tap is always a guide.
4: I tend to shoot in one second bursts.
5: D200-D400 is optimal for me.
6: My convergence in the Spitfire is set to 375.
7: The larger the cross section the easier the shot.
I hope that helps.