i use the following code to load cforms II wordpress plugin only on my small CONTACT PAGE

(http://www.deliciousdays.com/cforms-wordpress plugin/)

#/template/functions.php

    add_action( 'wp_print_scripts', ' ', 100 );
    function my_deregister_javascript() {
    if ( !is_page('Contact') ) {
    wp_deregister_script( 'cforms' );
    }
    }

    add_action( 'wp_print_styles', 'my_deregister_styles', 100 );
    function my_deregister_styles() {
    if ( !is_page('contact') ) {
    wp_deregister_style( 'cforms' );
    wp_deregister_style( 'style' ); 
    }
    }

but does not work

the code labored for contact page 7 ( http://wordpress.org/extend/plugins/contact-form-7/)

Maybe you could attempt to hook to wordpress_mind, wordpress or init and take away_filter('wp_head', 'cforms_style')