Experiment wit it. Just pull a woofer out and slide some in right behind the woofers and hear what the effect is.
I may try adding a little more in a few days or so. The bass is sounding pretty darn good right now. It might have lost just a tad bit of extension, but if it did, not by much, hence why I'll probably play around some more poly in a few days. I just want to sit, relax and enjoy some music before going back to work tomorrow.
Speaking of sounding good, I think those huge Sonicaps are starting to come around already. The midrange was sounding a little "boxy" and closed in last night and this morning, but all of that has gone away in the past couple hours of listening to some U2 (Achtung Baby, All That You Can't Leave Behind, & now Joshua Tree). I'm sure this is just the beginning of goodness that's to come. Probably a couple of weeks I imagine before they really settle in.