HELP Speakers sound brighter and 3D stage is lost

Audiophile Gurus,

I just have moved from a bigger place to this place where my music room is 12x16 fts.

Since the room is small I have placed the speakers about 6 inches away from the walls and about 8+ft apart. Now they don’t sound nearly as good as they did in my old place where there were about 9+ft apart and 4ft away from either of the walls, I use to get a 3D stage and the overall effect was incredible. Since they are new they sounded a bit harsh in my old place as well.

My setup:
Speakers: B&W 802N (only about 30Hrs on them)
Amp: McIntosh 352Mc
CD player: Levinson 39 (I am not using a separate Pre Amp)
Cables: MIT 750 Shotgun speaker cables.
Medium impedance MIT shotgun interconnects.

Is there any thing I can do:

1. to reduce the brightness besides waiting for them to break-in.
2. What can I do to get the 3D image back?
3. Is preamp a must for this configuration?
4. Will a subwoofer like REL help by pressurizing the room?
5. Any other pointers :)

Thanks
Sukhi