Maybe add honey..? I am currently doing a Marzen (Lager style) and added 2 lbs of honey to the recipe for 2 reasons.
1) For a hint of honey to the final product
2) primarily to boost OG and ABV
It defiantly did the first.. (Recipe OG was 1.052, I ended up at 1.062 and had an extra half gallon in the batch (At 5 gal it was 1.075))
Let you know how it goes.