If I had your speakers I’d absolutely hop on these Clayton Audio M100 monoblocks as they are truly special amps that I think will synergize beautifully with your 803Ds. You can use them in low bias mode when idle and even for HT, but for serious 2-channel listening you can switch into full Class A, and I think your speakers will open up and thrive on Class A power and these will likely stomp the performance of your Rotel. Incidentally, if you still have your speakers positioned as they are in the picture I’d try pulling them another foot into the room and see if your imaging/3D soundstage improves. FWIW.
https://www.usaudiomart.com/details/650035145-clayton-audio-m100-monoblocks-w-vh-audio-power-cables/