Attention!
Those who bought the
Entagled Covet books you may find the text is quite large if you try to convert the book in Calibre or send via email to your Kindle.
It seems the publisher has started adding the font size to the Declaration tag!

I've never come across this before in the hundreds of books I've converted. It just is sooo wrong!
You will need to use Calibre's Search & Replace to fix it.
Find:
<html xmlns="http://www.w3.org/1999/xhtml" style="font-size:1.136rem;">
and replace with
<html xmlns="http://www.w3.org/1999/xhtml">
This appears multiple times in the document due to the way a epub/azw3 is split up.
Also if you find the Chapter headers too big you can tweak the style sheet.
Find
p.Chapter-Break {
-epub-hyphens:none;
-webkit-hyphens:none;
font-size:1.833em; <---------- Change this number here. I put mine at 1.5em
I've converted 3 books so far and they all have these problems.
I found a quick and easy way to tweak the Chapter Headers & Title which are way too big in the mobi format.
In Calibre's conversation window go to
Look & Feel Tab
Extra CSS Box
Paste into box:
p.Chapter-Break {font-size:1.5em;
p.Title {font-size:2em;
p.Title---Extra {font-size:2em;
This will override the style sheet. The original is 3em on the Titles which is HUGE on the Kindle.