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Joe,
it surely looks as though there's something wrong with your spar profile. I would think that the sides would be parallel and the top and bottom milled to different angles to fit within the ribs.
Clearly, neither of the profiles you show here would fit. as to whether the face should be vertical with respect to some aircraft datum or perpendicular to either the top or bottom of the rib at that point, seems to me for a spar of the size shown to likely be more a choice by the designer of how to describe the structural geometry than how to best carry the load.
keep at it, john ferguson
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