Word/Page Count in Nonfiction Book

I’m hardly ever at a loss for words. Whether that’s good or nor, is of course, open to question. As I do self-editing on my book, and am adding significantly to one of the chapters, I’m concerned about the word and page count. From what I have seen, it appears that most Christian, nonfiction work for general audiences is around 200-250 pages. I was unhappy to have someone at Baker Books tell me that they change the font size to make that page count. I think I’m probably over 250 pages, but I can’t decide what chapter to cut. Any suggestions for how to figure this out? Given what I am writing, if I deleted, say, the chapter on praying imprecatory psalms, most readers would not miss it, I’d guess. Or, is it okay to go past 250 pages? I know novels can be much longer, but Christian nonfiction books for general audiences don’t seem to do that. Thanks.

Ken