“In the context of my system the E-800 lacks dimensionality, resolution, and bass articulation”
I appreciate your feedback. I just looked at your system, sweet setup in a large space. To be fair, comparing E-800 in your system is like driving Ferrari with a Hyundai Santa Fe engine. Your PL-500 rated at 91db with min amp ratings of 150-400 watts. So I am not surprised that you needed something like JR mono’s with 300 watts ratings in 8ohms to appropriately drive the twin towers and fill the room.
I believe a more appropriate and fair comparison would have been driving the PL-500 with Accuphase A-250 mono’s and C-2450 preamp.
At the end of the day, it’s all comes down to finding the right synergy and match between components. And you found that nirvana with JR components!