I did a little reading about the two speakers; from what I can see from the Stereophile measurements, the B&W are hard to drive; you seem to have enough power for them, but my best guess is that the synergy with the older Klipsch is superior to what you've set up with the B&W.
See: https://www.stereophile.com/content/bw-802d-loudspeaker-measurements
"The B&W's impedance plot (fig.1) reveals the speaker to be moderately difficult to drive, with a magnitude that drops to 3 ohms throughout the upper bass and an awkward combination of 4 ohms and –50° electrical phase angle at 60Hz"