BTW, D-9 is not the most popular 190 among the JGs. From what I have seen, the real workhorse is the A-8.
This can be attributed to a certain difference in style while flying the A-8, as well as to 2 extra cannons.
Ability to deliver more lethal highspeed snapshots counts more than ability to turn back and having to do it all again, no matter how easier it is.