🚀 go-pugleaf

Not one of the experts around here, but I imagine Minion Pro which comes with CS2 would be an appropriate choice for the use - not sure on the style though as this relates more to subject matter, audience, branding etc. Minion does seem to set into a smaller space then Palatino

Have you tried decreasing the leading and maybe a wee bit of negative tracking in your paragraph style? Though this will 'darken' the page colour.

Also coming from Word you may be adding an empty line between paragraphs, this is a bit of a no-no and you should use the "Space after paragraph" value to add a bit of space but not a full line - this will also save some pages, but again will 'darken' the page.

Hope this helps give you some things to look into, and I'm sure you'll get some more advice from the more experienced people here shortly.