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I can't Help I don't own a Sage. My only suggestion would be the obligatory tightening of the pivot (which I am sure you have all ready tried). I would also post your question over at the Spyderco Forums there are lots of really knowledgeable people over there as well.
Amani28, I have always had good luck reassembling in this order. (1)Get all the scale screws, and pivot screw started.(2) First tighten the scale screws just to snug(not tight). (3)Then tighten the pivot screw as tight as you dare, of course not to stripping!
(4)Tighten the scale screws down. (5) loosen the pivot untill you get the opening action you like!
I have had at least 30+ knives taken down and reassembled, in the last couple years, and all ended up centered.
Good luck, Dan.