It's most likely not your system but the additional size to the room. I would bring the speakers out more in the room. Also because of the extra space you might be having problems with slap echo or other room anomalies. I would try some acoustical damping along the upper corners and possibly on the front and back walls. I am sure you will get things right.
PS the new room is in the same house or another? I ask, because the material used and with the structure has it changed or is it the same?
PS the new room is in the same house or another? I ask, because the material used and with the structure has it changed or is it the same?