your room looks fine regarding the baffle- placement, the Prometheus- baffles can be placed with more space inbetween (bigger soundstage).
Your 85 Watts- poweramp is more than enough with the Prometheus- baffles in fullrange- mode, even at higher levels than you can achieve now.
Regarding your woofers the cones have high mass, this must be stopped (controled)on the system- resonance by the amp, even in a sealed cabinet. This is hard work for the amp and the more electrical damping is needed the more the amp slows down in the crossover frequency- range which can produce a "break" inbetween the baffles and the woofer- section. Also you use the woofers in parallel, the lower impedance results a lower damping- factor of the amp on the woofers. You can quick- check if the amp does this work fine by simply removing one woofer per channel and listen if there is more "attack" and better control. If so you can look for a second identical woofer- amp, maybe also place the two amps in the ceiling nearby the woofers and connect them with very short cables, this also helps the effective damping- factor on the woofers.
Regards
Robert Bastani