It is good to see that your historical novel is progressing. I am a little more interested than before. I am going to honor your instinct and the voice of your muse that have guided you to compose this ms.

However, if you want to get published, you need to know that you are doing things that make it harder for us to accept your book. As with most writers, you have no way of knowing these things (and the formula changes from one Publisher to the next). Publishers do not talk about their "real" requirements because they want to keep all authors and all mss in play. They want to toss out 999 mss that are obviously wide of the mark in order to find that one book that will possess transcendent writing and will supercede all of their rules.

Our art books, photography books, and books designed for collectors will be published in hardcover. The rest will be paperback and eBook originals.

Our purpose is to bring the heart and soul of American and World writing to the public. Not salad dressing. Not sprinkles on top of the cake. Not bright media candles that will soon be blown out. We want to touch eternal truths that are delivered by good writers who have expertise and great compassion, sense of history, empathy, and insight. If the language provided by our authors is extra-sensory, this is a good thing. We are in favor of pushing the boundaries of literary art. But that is on top. What we want is depth of insight delivered in plain flowing prose.

This means that we will normally not be publishing authors whose names are in the media. So, the most we can charge  is $16 in paperback. 
Our approach is to print sparingly so that we can carefully test the market and then quickly pump books into the marketplace in the locations where there are sales.
Both of these points argue in favor of books that are 128 pages long (4 signatures of 32 pages each) or 136 pages at the most ( 4 sigs of 32 + a quarter sig of 8 pgs). You are now at 192 pages or 6 signatures of 32 pages.

Think about the cost tradeoffs with different technologies. Any strategy that makes use of a mix of offset printing / short-run offset / POD will have a higher cost per page printed. In traditional offset, the cost is nearly all in the setup. The length of the book does not increase the cost of production as much as you might think. However, with POD, the set up is free, and each page is expensive by comparison. (Think of it as, each page that is printed bears part of the cost of setup.) So, to the extent that POD is part of the first run or the backlist strategy, there is an advantage to keeping books short.

Buyers will purchase books at $16. If we are going to charge $18, the book needs to be 8 or 9 signatures long. So, when you create a book of 192 pages you have pushed your book into the "dead zone" as we define it at this time.
Your current ms is 67,000 words long. Do you have a way to fit your book into 38,000 - 45,000 words? This would be ideal.
The other problem is organization. 30 chapters is waaay too many for readers to keep track of. And, each chapter title page burns an extra page or two in the process of typesetting. We like to use wide margins and the traditional point size and leading for trade books, nothing scrunched, nothing tacky. So, we need a way to create this spacious look without using too many pages.
An  organization that is much easier for a reader to follow and has the added advantage of saving pages  . . . is to divide the book into 3 or 4 sections. Use a roman numeral for each section and then, for color, provide a quote that will be a line or two long and will run below the Roman numeral. These quotes could be from contemporary sources to help you make your point. Or, they could be from contemporary sources on the pro- or con- side of things. Great quotes will make the book, as long as the story flows and the book is affordable.
So, I would like to hear all the wonderful things that you have been telling me about your book that take place in 38,000 - 45,000 words, in 4 sections of 6 - 8 chapters per section. Even 3 sections of 8 - 10 chapters might work.
I will also need, very important, a two part bio. See my post on Author Bios.

     -- Scott C. Davis
         Cune Press