Didn't you have a different plan for a center? If you decide to ditch yours let me know. A front ported design like that would be interesting if you took pricing ques from Kurt.
I honestly couldn't tell you what kind of difference having the front ported design makes since both centers were so far from the wall. I will say that the RAAL helps it measure a little bit flatter and increases power handling.
Basically, given the current setup, listening distance, and required SPL's I couldn't imagine a center sounding better. That said, couldn't hurt to try
When the WTMW comes out all bets are off.