Ok lets think about that for a second.
LA7 has 3 canons in the cowling, hitting with no convergence no matter how far or close. Since you fire at him he has a straight shot as well.
N1k has 4 canons that are spread out on the wings, no matter where you have the convergence you will hit multiple points of the other aircraft, since when he closes from 600 to 200 he is only a verry short time at the convergence point, wherever it is.
Now considering that the n1k should explode and fall out of the sky while the la7 is severly hit, but you only got a pilot wound? Then both of you didnt hit verry well.
You say he got you with pilot wound, is that he killed you right away or you were wounded and frequently blacking out? Consider he had a pilot wound as well, you might not eaven have noticed.
Also front of the plane is the motor block, which is pretty solid. As well as the wings are constructed to take some hits, the ll have holes but that doesnt matter much.
Now do you know how much damage the la had, how much damage did you have?