However, I've got to figure out what the best ratio for combining chapters is.
If you ever work that one out, let me know!
I write in chapters and sub-chapters. Yes, some run out way too long, but most don't. Which is why I combined chapters and sub-chapters to make a Posting Part and make a break at the end of a chapter or sub-chapter.
The way I decide on the breaks is: I know roughly how many words go on each of my 6 x 9 inch format pages I write in. So I look at break point at about that many pages, then use the software to count the number of words and characters in that, if it's near the 8,000 to 10,000 word mark I let it stand (for now). I make a pass through assigning arbitrary breaks like that. If they all come out as good, no worries and that's it. But sometime one chapter is just too long, so that becomes one Posting Part which will likely have multiple pages, then I look for ways to properly break up what's before it and after it in fairly even cuts.
I try to make 5,000 words the minimum and 10,000 words the maximum for a part, but can't always hit that. BTW I say 10,000 words, but the reality is the SoL system will break into pages after 58,000 characters (including spaces, punctuation marks, and coding instructions in the text - including formatting ones) which nominally equates to 12,000 words, but never does. Thus I aim for the 10,000 word mark as being within that character limitation and still a nice read.
It's because the Posting Part cuts are arbitrary that I post my Real Table of Contents broken up into Posting Parts with the story.
I hope this is more helpful than confusing. But the bit to watch is the 58,000 characters limit.
typo edit, of course