After some suggestions, I did more digging into the Daily Digest section and I did discover that I had increased the size of the display on Forum posts, so they should be displaying full as they have been, but I had not increased the character limit on the Site News from the front page, so that was being truncated to 200 characters. I have increased that to 2000 characters, so hopefully it will now display the news in full if we do updates.
That should rectify the Digest only displaying partial messages (I Hope). So we will see if it helps.
Thanks for your patience as I hack through some of the more complex configurations on the site.