In your previous room you were able to get impactful bass at 87dB, but in your new larger room the B&Ws start to run out of steam before you hit 80dB. These are not particularly loud listening levels. The B&Ws are not an easy load, but the Parasound JC1 should be more than sufficient to get you above 100dB in near or mid-field listening. I would not change your loudspeakers until you experiment with loudspeaker and listening position. I'm guessing, but your room may have a frequency response null in the mid-bass range. Using your SPL run some frequency sweeps to gain more information.
Big Below 15k used that can play loud as heck
I moved into a way larger room, roughly 20x24 and the 802D’s just ain’t cutting the mustard. Looking for good options that can pound out bass in a large room with 500-1000 high end watts (pass or levinson etc)
Currently running 2 JL Fathom F113’s so it’s not low bass, it’s a speaker that can pump concert level music playing rap, hip hop, reggae, rock and classical/audiophile stuff etc. but I need my rig to blast rap and hiphop impressively more than anything.