I don’t perseverate too much on cables, although I do believe they make a big difference. I needed one 22-foot length cable to run from my Steelhead to the built-in amplifier on a Beveridge speaker; the other channel needs only about 12 feet.
OMG thats even worse.
Unequal lengths - so the phase shifts at various frequencies through the cables will be different for each channel.
I cant see how the Manley can drive 22ft cables without loss.
You would be better off running short interconnects and decoupling the Beverage amps - extend the cables between the Beverage amps and crossover. I would expect significant gains with this alternate arrangement.