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Its entirely possible that the spider and vanes are not perfectly mechanically centred, and for everything else to be well aligned.
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Guess what.. I think you're quite right, I tried measuring again with calipers (a bit hard, dividers would be more accurate) and it seems the spider is definitely off-center on the same axis that it appears out visually (maybe 2mm, no more, closer to the focuser). Since, if I read you right, it sounds like this won't really affect sharpness or detail too much I might just live with it for a while, I'm generally really happy with what I'm seeing thru the scope (sample of one though since I've never looked thru another scope) and the views have certainly improved since I got the collimation tools (really noticed on globular clusters.. much more "resolved").