Like most have said, you gotta make your barrel-rolls tighter (eg more in the vertical) more a compressed spring than a stretched out spring. You entered the rolling scissors faster than the hog, which almost guaranteed you would overshoot. Plus, and worst of all, IMO, is that desperate attempt at a snapshot before you overshoot only compounded your problems. To take the shot you have to fly straight which makes your overshoot happen much faster.
My advice, in that case, would have been not even to bother rolling with the slower hog, i would have seen what he was up to, and extended out to the lower left (away from his roll), then go into a spiral climb or something where you would have the advantage.