To be fair you should build fixed pad for the 288's to try to get the L-pad somewhere in the middle of it's range with the 288's.
To balance a passive system i like to start with the HF way low and bring it up slowly to more or less a point of balance. It sounds like the L-pad is hugging an extreme to get the 288's close to their balance point which is gonna make it pretty hard to make a fair assessment.
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