Elarging the horzontal total area to something about 20 to 25% of the wing area will ensure you DON'T have a wild model. The small stab will cause that, not a larger one. The vertical area should be about 12 to 15% of the wing. The hinge lines for the surfaces can be whereever you think you want them. Lots of movable area for that 3D model and only a little bit if you're after a sedate trainer like model.