Don't do backstretch on the Kickstart Pro homepage (not tested, assumes you're coding a custom solution instead)

functions.php

<?php

add_action( 'wp_enqueue_scripts', 'kickstart_enqueue_backstretch_scripts' );
// Enqueue Backstretch script and prepare images for loading
function kickstart_enqueue_backstretch_scripts() {

  	// Don't do any backstretching on the homepage (CUSTOM)
  	if ( is_front_page() ) {
    		return;
  	}

	// Load scripts only if custom background or featured image is being used

	// If we're on a page with no featured image or background image, leave
	if ( is_page() && ! has_post_thumbnail() && ! get_background_image() ) {
		return;
	}

	// If we're not on a page and there's no background image, leave
	if ( ! is_page() && ! get_background_image() ) {
		return;
	}

	wp_enqueue_script( 'kickstart-backstretch', get_stylesheet_directory_uri() . '/js/backstretch.js', array( 'jquery' ), '2.0.4' );
	wp_enqueue_script( 'kickstart-backstretch-set', get_stylesheet_directory_uri() . '/js/backstretch-set.js' , array( 'kickstart-backstretch' ), CHILD_THEME_VERSION );

	wp_localize_script( 'kickstart-backstretch-set', 'KickstartBackStretchImg', array( 'src' => str_replace( 'http:', '', get_background_image() ) ) );

	if ( is_home() ) {
		wp_localize_script( 'kickstart-backstretch-set', 'KickstartBackStretchImg', array( 'src' => str_replace( 'http:', '', get_background_image() ) ) );
	}
	else if ( has_post_thumbnail() ) {
		$image = array( 'src' => has_post_thumbnail() ? genesis_get_image( array( 'format' => 'url' ) ) : '' );
		wp_localize_script( 'kickstart-backstretch-set', 'KickstartBackStretchImg', $image );
	}
	else {
		wp_localize_script( 'milton-backstretch-set', 'KickstartBackStretchImg', array( 'src' => str_replace( 'http:', '', get_background_image() ) ) );
	}

}