You need to add a potentiometer to lower the signal to the lower gain amp, the McCormack.
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Hello Daltonlanny -
Kr4's answer is essentially correct - you need a way to turn-down the input level on the higher-gain amplifier to match the level from both amps. The gain difference is only 2dB, but this is still enough to throw-off the coherence of the speakers. The problem is the one we always have to face: if you add anything to the signal path, it may affect sound quality in some way. But, if you use good parts and cables, the loss should be minimal.
I suggest that you take a look at the Axiom passive preamp for sale here on Audiogon. It looks like a good basic level control at a very reasonable price, and it will save you the hassle of trying to build your own.
Please give me a call if you would like to discuss this further.