If your experiencing flame out during snaps, flat spins, or blenders, I would look at the idle position first. Do you perform the snap by going to quick idle ? I use to have that problrm with several brands of engines, so now I increase the idle trim about 3 clicks after take off, then pull it down before landing. Keeps the fuel flowing to the carb. Try that before you throw away the engine.
By the way, I don't ownd a DA, never have, probably never will, but that worked on my ZDZ's, Sachs, and Brisons. May be the solution, may not.