Hi 12 oc aren't the best way, IMHO. With hi 12, the gunner only needs to lead you in the vertical, not the horisontal.
Really fast attacks from between 10 to 2 works best for me. Also gives you a nice shot at the wings.
hm, of course, the hi 12 attack could be done like some attacks on m16 I've seen - rapid drop in altitude, level out, fire fire fire, drop in altitude. Works against M16's (read: me in M16's

) so might work against buffs.
If there's a skilled buff gunner, even a great 10-2 o'clock hi fast attack will be very, very dangerous - especially if you attack the Würger way, by getting really close before opening up, and passing the buff with only inches to spare.