i fire away at 400
The range is a bit too far out, I'm afraid. If we take a look at the planes you use;
- Spit5
- Spit2 (Seafire)
- F6F
- N1K1
You will notice that these are all more or less 'slow' planes at deck, with the exception of the F6F, which would be rated at about average.
You will also notice that these are all wing-armed planes(main armament placed at the wing area).
In a MA infested with '44~'45 planes, the window of opportunity to open fire upon an enemy aircraft with those planes, is very small, because they are so slow.
What makes it worse, is that these planes you use are all wing armed, so only at the single convergence point you've set will all the rounds meet, to deal out maximum damage. Further or closer than that exact range, and it is highly likely that your firepower will be reduced, in some cases by more than 50%.
So I recommend that you reduce your convergence to around 275~300, and only fire when the enemy con is inside that range. I know that it is difficult to do so in such slow planes, but empirically, trying to hit a plane speeding away from you over 400 yards with wing armament is a waste of ammo, no matter how far you set your convergence out.