I can see that it's not ideal for books because it's so narrow. It's in TNR because I've always quite liked it and hadn't thought very much about fonts when I started writing - and I hadn't even realised there would be copyright issues with using fonts. Later chapters are a little less dry because they deal more with human experience. As you can see, it's very much a textbook in this chapter. I'll attach the first two pages of the book, which is still needing final proofreading.
Thanks very much for taking the time to reply to my post.