Did a mock up of my SGM build and with the neck sitting relaxed and evenly without glue in the slot I get the same (very similar) string offset as you.

Only way that I'm going to get my strings to run down the centre of the neck is when I eventually set it with TiteBond is to push down on it quite hard at the headstock as I tighten the G clamp, which is a prospect that I'm not looking forward to. Looks like mine will need two strings on it as I set the neck just so I can be sure it sets correctly.

If your neck is/was as tight as mine I don't fancy your chances of getting much correction if you try and reset your neck...