when you bottomed it out you made your ata longer. if you weren't perfect where you were, the nock height could have changed because 1 limb could have taken more turns - getting longer than the other one. also it could change your center shot a bit. the slight change in ata effects the angle the cables take to the slide, which can affect rights and lefts - so i'd walk back tune it again - as its your only option - before playing w/ spine if you think that's right.