Hello David,
I’m sorry if I missed another question. You’re right that the typography size options aren’t completely explicit for each type of text and heading.
This is because the BoldGrid Theme Framework automatically computes the font sizes of the various headings programattically based on the option you choose in the Customizer.
However, you can of course always get full control of your text and heading sizes in your Customize -> Advanced -> Custom CSS & JS menu by using CSS rules similar to this:
body h1 {
font-size: 24px;
}
You can adjust the selectors and sizes according to your needs so that you can get fine-grained control of your typography.
I might also recommend the plugin TinyMCE Advanced which lets you control the font sizes from directly within the editor:
I hope this helps!