Does the vinegar get rid of boar taint? I've heard apple juice or orange juice works well for that.
Good shot. You were standing up and that partly made up for the angle. Did you say which pellet you were using? Be Well, Packy.
Thick cover and close does not sound like the most enjoyable way to hunt for a pig. A friend was hunting with a guy that only wounded a hog and he said that after it was shot it was not pretty at all. I am glad that you got a quick kill.