Dennis,
Have you ever considered designing an alternate woofer module for the Phils with the fundamental intent of pairing it with a subwoofer?
I'm guessing you could get a good 7" driver designed for a sealed cabinet and put it in a smaller box and have good FR down to 70-100Hz.
It would address much of the WAF and cut cabinet and shipping costs. I don't know how many of your customers are using subs with their Phil2&3 speakers, but just wonder if it would make sense to have such an option without the size and cost of the T-L design (while assuring the same SQ from the mid-tweet module).
Just wondering - you've already got my money!
Cheers,
Kurt