That is rather odd EQ for similar sounding guitars. Looking at the numbers you posted IMO your first install seems to be the weirder one. I doubt very much the soundboard construction, even if different, would impact the HFN if the 2 guitars sound similar acoustically. Again that's my opinion and I could be wrong. Sounds like a scenario that you should mention to Les to see what he thinks.
Of my HFN installs I never put one in 2 similar sounding guitars. I also seem to be one of the only ones who report plenty of bass response. Curious to hear the real answer.
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