I think the caps for all headings is a bit difficult for reading. Could we change heading two, three, four, five, six to sentence case?
In fact, headings four five and six are so small I don’t think I’ll use them but safest just to change to sentence case for anything except heading one – what do you think?

This is Paragraph

This is Heading One

This is Heading Two

This is Heading Three

This is Heading Four

This is Heading Five

This is Heading Six

This is Preformatted

SUES HEADINGS

This is heading one

This is heading two

This is heading three

This is heading four

This is heading five

This is heading six