You lost me at 11.2....
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A multichannel system should have timbre matched speakers. Using all identical speakers is the absolute perfect timbre match. Subs do not need to be the same brand as the other speakers, but when using more than one, they should be the same, which you are doing. Your biggest problem is the Kappa fronts/wide and a Kef center. Going to ML fronts, Kappa wide, and Kef center will just compound the problem.
I use all Quad ESL's of the same generation. This provides a coherent sound, in which a 32Hz C clearly differs from a 36Hz B.
Not much bass below 30Hz, but everything above that is sublime, and that's 99% of the music. I suggest that you try it sometime - put a 12dB filter at 30Hz in front of a sub, disconnect the rest, and listen to the complete absence of signal, except for the occasional undifferentiated thump.
Every sub I have tried adds far more mud than signal, although I have hopes that, eventually, I can make my isobaric magnepans work out.