Oversize I believe is the cleanest way but will require headspace consideration. Sleeving your existing bolt works equally as well and has the advantage of being able to sleeve just the rear where most of the wobble occurs. The disadvantage of the oversized bolt is the action may be prone to siezing up with a bit of dust. Sleeving your own bolt will also allow putting a bit of cam on the sleeves to allow full clearance and only having it tight when you actually close the bolt. There is no one best. I should add if you are doing a full blueprinting and changing the bolt you really ought to consider a custom action.
__________________ Build a man a fire and you heat him for a day. Set him on fire and you heat him for life.