Don't forget when you take part of the crossover out the passive box and replace that part with the active cross over the speaker impedance is likely different than what the manufacturer has published. When I had my 3.3 actively blamed I had the horizontal that way I was able to ture the base separately form the mid and top end. By using different powercords and interconnect s.
I find it perplexing what you really are wanting. On paper your amps are bigger than my w3 amps the moons were known to be able to swing large current. But that being said Maggie's need that and not only was there never a need at any volume the need of more power there was the sense of ease that comes with a hi-fi with big power. You don't need a power number to accomplish great sound in fact the numbers game is a mid fi low fi game. In horizontal configuration you have separation before the amps so that each amp only receives the signal it is going to drive.. I should say that the room I was I n at the time wasn't huge but not small either. Around 3200 cubic feet.