Buff hunting with a rocket-laden 110 is one of my favorite things to do, and I've had a bit of success.
There are some variables, but mostly I launch right when the range icon changes from 1.5 to 1.0. You need a little bit of lob, so put the center of the formation right in the bottom of the sight.
Do NOT continue to fly in, waiting for the detonations, but break right after launch to avoid tail gun fire.
I launch two rapid fire, and often I will get two, or one and two smokers. Occasionally, I will get all three, which is most satisfying.
Film your attacks to fine tune the process, and see how different speeds affect the attacks, and prepare to get killed a lot.