Oh yes. I have actually been running some tests since my post.

I tried setting the cross over higher to transfer more of the power requirement to the sub amps. With each step(60,80,100,120) there was less distortion at -25db.

Then I disconnected my rear surrounds (Polk Lci) and played my throw down demo scene ( Amidala's ship exploding in AOTC). This time the explosion was as I remembered it with no distortion. I am afraid to test it at anything higher than -20 though for fear of damaging my speakers.

Can I alleviate some power sucking on my 770 by putting a couple of monoblocks on the LSIfx's? I like to play my HT at -15 on average so I may just need some extra juice. That 770 runs wicked hot also with all those 4 ohm vampires.