I must have missed something. It looks like they all got away.
That flopping around does make bullets miss. you may get him eventually but I've seen many times where a plane flops out of the way of a well aimed shot and the plane dodges it like NEO from matrix. 190 are particularly good at becoming "invisible" when stick stirring around my gun site. what bothers me is that the plane seems to move in ways that are not possible. I would think a plane should always move fluidly, means the plane would have to rotate about's CG before the CG translated in one of the three degrees of freedom. But that doesn't always happen. Sometimes the rotations and translations seem to happen simultaneously, or the bandit translates up and down and there was no visible pitching of the airplane. This is important because the rotation should lead the change in direction. And that should make it easy to lead the shot. without, I'm firing and hoping the timing randomly produces a hit.
Of course this is exaggerated in a K4 or a P-39 [planes I fly mostly] where you have 60 and 39 rounds firing from a single cannon. There is no dispersion pattern that ensures hits like there is with 6 wing mounted .50 cals.
I don't know if this is caused by update rates, even in close quarters, or something else. on my screen, my planes seems to fly fluidly and perfectly predictably, so I assume the flight model is correct. But if there is small gaps in position vector transmission, this could make the plane appear to be darting around. Almost like warping does, but on a much smaller scale.