Don’t Show “More”

I don’t think you can do that by using More.

You can try using manual excerpts instead. They don’t appear within posts, and you can use Excerpt Editor to make the homepage display your manual excerpts instead of any content you have above the More tag.

http://www.laptoptips.ca/projects/wordpress-excerpt-editor/

http://wordpress.org/extend/plugins/excerpt-editor/

If you are interested in how excerpts work, I wrote an article recently:

http://op111.net/67 — The manual Excerpt in WordPress: What, why, how, tips and plugins