I tried H1 and it was HUGE I don't even use it for the book title. Honestly, I've been using f3 for the book titles.
Technically you can switch it so F2 is the title size and f3 is the chapter size. I just haven't because when I have the title, I also add the author and what part of the series so with F3 I can fit all of that on one page along with a cover image but with anything larger sometimes it doesn't work. Plus I rarely look at the front page anyways. I've been using the TOC to skip to part 1 more often than not.
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Technically you can switch it so F2 is the title size and f3 is the chapter size. I just haven't because when I have the title, I also add the author and what part of the series so with F3 I can fit all of that on one page along with a cover image but with anything larger sometimes it doesn't work. Plus I rarely look at the front page anyways. I've been using the TOC to skip to part 1 more often than not.