If the problem is with the stereo image, that can be fixed with a bit of trickery.
I'm not at all experienced with Sound Forge (I use Audacity), but if it has some way to do so, convert the Left/Right signal to a Mid/Side signal. The resulting "side" signal can be distinguished by its lower amplitude.
Take the "side" track, and duplicate it. Apply phase inversion to the duplicate track; make the first side track the left side, and the second one the right. Make this new left/right pair into a single stereo track, and make the Mid track a mono track, or otherwise pan it to center.
You can now play with the stereo image by varying the Mid and/or Side levels; reducing the Mid or boosting the Side will spread the stereo image out, while boosting the Mid or reducing the Side will focus the image.
Once you have the stereo image the way you want it, you can export the resulting audio.