Declicker comes with a page of notes.
My first pass would be to change the Sensitivity Threshold. My impression is it’s too sensitive and it thinks everything you do is clicks to be suppressed. That gives you the muddy sound.
Some are random clicks–assuming background noise and moving chair or whatnot.
It’s nice to think there’s software to remove “everything that’s not supposed to be there,” but “clicks” appear as a relatively narrowly defined personality and that’s what the software looks for. You may get to remove the chair yourself.
I have not submitted the book to ACX yet—that is Wednesday.
It’s too late, but there is a process for submitting a short test to ACX, rather than taking a chance on the whole book. It helps avoid messy surprises.
Even though ACX demands submission as MP3, it is recommended that you export final mastered work as WAV for archive. Then make the MP3. You can’t change an MP3 in post production without causing sound distortion.
Also, It’s very highly recommended you export raw readings as WAV—before you edit or change them. We can’t take effects, filters or corrections out of a show or Project. It’s possible to “over master” your work and without the perfect quality raw readings, you’re stuck with reading it all again.
Audacity Projects do not make good archives.
Good luck.
Koz