I like your system a lot, but I need to ask what did the Townsend Seismic Speakers bars do for your Cornwalls? A person I met recently has the Podiums under his Von Scheikert speakers. He's really sold on them, and recommends I get some under my heavy custom built Tannoys.
They are quite expensive for the size 4 podiums I would need, so I'm hoping to learn what to expect, should I decide to buy them.