I have faced this many times in the past. While extreme cases of forwardness is a difficult situation for moderate corrections it is rather easy. The first thing I would look at for such a treatment is power cords. Typically power cords have the highest effect in taking the stage forward or backward. If you want to take it backwards try these:
1. Transparent Reference
2. ESP Essence or the Essence Reference
3. Yamamura Millenium (any one will do from these, they area amazing for source)
4. Cardas Golden Ref.
There are many more which do it, but these are the cords I am certain will help you without taking away anything from music, rather adding some to it.
Please remember these are power cord recommendations, not IC. If your system is biwirable, do try biwiring it, it will immediately relax the stage.