I've got mine (well, the f12.5 version) in an Alphax. No calipers to measure the spacing, but in that shutter, I've got sharp coverage on 8x10 or 5x12. If I apply any significant movements with it on 5x12, I do get perceptible loss of sharpness in the corners, but they remain illuminated within the range of rise/fall that my camera allows. It's one of my favorite lenses for large format. I'm pretty sure you've got a lens that's either mis-aligned or mis-configured internally for it to be that far out of whack.
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