Pinion angle question

Ok I got the original rear end up and checked this is really confusing me. If I place the arches down and level I'm getting like 5 to 6 degrees up with the arches up and level I'm getting like 8 to 9 degrees down? HTF is that possible? I double and triple checked and everything is level. I dont get it. I think I'm gonna meet it in the middle and weld them at like 6 degrees and call it done.

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