I'd agree with the 2 above posts...

If it's 1/4" difference on a stab that size, it's enough to impact the plane's tracking and level flight, but not enough you can't trim it out. My own super stick is off by that much, and it flies fine with just a touch of trim.

Also, as suggested above, heating the epoxy and using some weight or clamps to pull the stab back where you want it might remove some of the problem.