Please see my posts from this topic here at AC: https://www.audiocircle.com/index.php?topic=150989.0
Ten dB sounds like a lot, but I'm the wrong person to comment other than hopefully it's the break in aspect of it rather than a problem with the new crossover.
My girlfriend also could care less about sound quality. Usually, her reply is "I thought you got it to where it was great why do you need to do more?" To which I reply, "because it will sound better".
I would say overall, for me, the biggest change in the crossover upgrade is texture/palpability. Hearing what I guess they would call low level information, let's say for classical plucked strings, violin, cello notes have a fullness that previously was flatter sounding. Of course if you hear plucked strings better, plucked electric guitar notes also carry more weight, as do vocals--pretty much everything sounds more fleshed out and fuller. With the path audio installed, the presence factor, again using orchestral strings as an example, fill the room vertically as they do at a concert, with more air. All of these improvements for me are money well spent. There is the danger that as a system becomes more sensitive one can hear more of the bad recordings or nuances that would be a negative, but overall I would say that recordings that previously sounded good, sound very good, and that recordings that sound great, sound fantastic. Hope this helps!