Try adding this code at the top of your page_portfolio.php (right under the first ““)
// Adds Page Title and Content
add_action('genesis_before_content', 'genesis_do_post_title');
add_action('genesis_before_content', 'genesis_do_post_content');
/** Remove Edit Link */
add_filter( 'edit_post_link', '__return_false' );
I’m not sure if there is an easy way to do #2. I haven’t customized a Genesis Category page yet, so I wouldn’t know the answer at the moment.