Well, Hajo, after hundreds of kills with D9 I've find out how to kill a 250 yards static target aproaching by its dead six. And this is not a joke, believe it or not, that situation ends a lot of times with only two or three pings.
In the past tours I've flown several missions with 50" armed planes (P47, F6F, P51 and P38), all of them have extremely accurate weapons, specially the P38. All of them able to disintegrate a 500 yards static target aproaching by its dead six with a single short burst.
Actually I continue flying D9, and using the GS center to aim at anything is the best way to fail every shot.
It may sound like a whine, but, IMO, there is too many recoil effect/vibration/dispersion for wingROOT mounted guns. I thought wing root was a very stable placement for these very lo-rof, lo-muzzle-vel guns. Based on this asumption, IMO, wing (not root) mounted hi-rof, hi muzzle-vel (supposedly very hi recoil effect) hispanos should have much more dispersion/vibration effects, specialy when spraying.