You have a discrepancy of only 1 mm on each side. Maybe not optimum, but certainly within tolerance. You can re-space to 126, but the difficulty will be getting it even on each side. It may be that one side or the other is off, or less likely that both sides are equally off. I'd leave it the way it is if I were you. Cold setting is not difficult, but not overshooting the 1mm target will be challenging.