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It seems those speakers are actually very similar to the LS3/5a design with a larger cabinet and a similarly complex crossover design. I'd expect them to perform better than the LS3/5a, so they are probably excellent. At my work, the LS3/5a's were usually powered by Quad 405 amps, or anything which could deliver a reasonable amount of current, because despite beingblabelled as nominally "8 Ohms", the crossover design meant that the impedance became very low at ceratin frequencies. Anyway, TLDR - your speakers' crossovers may not exhibit this same characteristic, but it's certainly possible.
Those Kefs are very similar to the LS3/5a speaker which I have used a lot (and own). Same drivers. I bet the treble sounds slightly "papery" and there isn't a massive amount of bottom. That's a nice setup you have. If anything, I'd maybe change the speakers if I wanted an improvement, but it looks like quite a nice setup as-is.