have you considered doing a semi-active setup?
horn compensation and high pass on top run off the avr.
active control dsp/big amp on bottom.
this way there is no choke on the woofer and you can get a big amp for not much money.
crazy, but built in dsp costs about the same as crossover components...and you can build in "baffle step correction" without losing any sensitivity.
it will all still be balanced because spectral content is such that the woofer will be sucking up 10x the power as the compression driver.
active for the win.
btw, looked around again and am not familiar with the combo that you have, though i'm sure that it will get worked up at some point.