I think we need a new center channel design. I realize that you have the VAC, which does indeed bring out the midrange (too much in my opinion). As well as the 522C for a center, I think this has to strict vertical placement to make it a good center.
I beg Aperion to develop a new center than incorporates the d'appolito design to increase the vertical placement strategy as well as incorporating the voicing of the 522 series speakers. If you could do this, I think you would have an unbeatable combination of speakers for both movies and music, the value vs. price would be impossible to beat.
Maybe you could also incorporate a passive sub design into the PT version speakers via a shorting bar. So when you upgrade to a higher end system, you can try out the passive design rather than having to buying a subwoofer to match, and/or, wasting the frequency response of the current PT design..