Do you remember what the wall behind you was like in the demo room, and how that compares to what you have at home ? I found that it took a *lot* of absorbent material on the back wall of my last room (like a pile of cushions covering most of the wall, or pillows held behind my ears) to get decent imaging.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8