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Why are 88-98 rear leaf springs not parallel?

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My friend is doing a SAS swap on his '96 and has the rear end out of it. While I was checking it out I noticed that the rear springs did not look parallel. Then I looked at the spring perches on the axle tube, and they weren't welded 90* to the axle tubes, bur crooked to match the springs. A few days later I pulled the rear from a '89 C1500, complete with springs, and they aren't parallel either. The front eyes of the springs are spaced about 5" farther apart than the rear eyes. It seems like as the springs compress that they would bind as the axle moves toward the rear. Any ideas on why they did this?
 
the frame is tapered heavy. the front bolts for the box are around 50" apart and the backs are 37-38" apart. .
 
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