Exporting without quality loss or DB change HELP

This is not my first audioboook but I’m editing in a better booth setup. My noise floor is a lot lower, which is good, but it causing some problems with export.
My book is finished and almost 7 hours. Right now, in audacity, all my settings pass ACX check. The noise floor is around 85/86 for each chapter. For example:
Screen Shot 2022-04-16 at 4.31.16 PM.png
When I export, however, than open the directly from the project to Mp3, than re-open in audacity to check the settings, they look like this:
Screen Shot 2022-04-16 at 4.31.51 PM.png
so I normalize, and then my noise floor is too low:
Screen Shot 2022-04-16 at 4.32.07 PM.png
I’m not sure what to do I’ve tried a million things today.

For one I tried exporting to WAV file first, just to see, and that has a whole different process.
In that case, I export as WAV first, and that stats look like this:
Screen Shot 2022-04-16 at 4.35.35 PM.png
So I normalize and up with -77 db, which is firstly, a loss of quality, the noise floor sounds way louder which I hate. But even if this were to work, I then export as Mp3, and when I open the file needs to be normalized again, so I do, and theoretically, it should be fine, but when I open that exported Mp3 it suddenly needs to be normalized again and essentially there is just no way for me to export this file so that the settings basically are retained.
It’s like I’m going in circles.

Either way, I’m try to not lose quality here, but first and foremost, this book is completely done and edited, hundred upon hundred of hours and it sounds great and meets the ACX expectations UNTIL I export it. Please help, I don’t know what to do, I’m at a total loss, I can’t figure out how to export this book and have it meet ACX standards. Why does exporting as MP3, or even WAV, mess up the DB and all the stats ? What can I do?


Check the track “gain slider” is zeroed before you export