Hello there,
Both themes are displaying exactly the way they are designed to behave, which is excerpts only on the front page of the blog but if it does have an active excerpt box below the post editor, you can control the length of the excerpt displayed. This is the workaround you can use to override excerpt display on the front page.
You compose your whole post first and before you publish it you switch to the HTML (Text) editor, copy the code, paste it into the Excerpt box, and publish the post. http://en.support.wordpress.com/splitting-content/excerpts/#creating-excerpts This will have to be done on every post.