Genesis Grid Loop - different number on first page

gistfile1.aw

<?php

add_action( 'genesis_before_loop', 'child_maybe_do_grid_loop' );
/**
 * Before we get to the loop, see if we're anywhere but a single page. If so,
 * swap out the standard loop for our grid loop.
 *
 * @author Gary Jones
 * @link http://dev.studiopress.com/genesis-grid-loop-advanced.htm
 */
function child_maybe_do_grid_loop() {
 
    // Amend this conditional to pick where this grid looping occurs
    if ( ! is_single() && ! is_page() & !is_home() ) {
 
        // Remove the standard loop
        remove_action( 'genesis_loop', 'genesis_do_loop' );
 
        // Use the prepared grid loop
        add_action( 'genesis_loop', 'child_do_grid_loop' );
 
        // Add some extra post classes to the grid loop so we can style the columns
        add_filter( 'genesis_grid_loop_post_class', 'child_grid_loop_post_class' );
    }
}

add_action( 'pre_get_posts', 'child_modify_query' );
/**
 * Modify the query's posts per page
 * 
 * @author Bill Erickson
 * @link http://dev.studiopress.com/genesis-grid-loop-advanced.htm
 *
 * @param object $query
 */
function child_modify_query( $query ) {

	// Only apply to the main query
	if( $query->is_main_query() ) {

		// Use the same conditional you used in child_maybe_grid_loop()
		if( !is_single() && ! is_page() && !is_home() ) {
			
			$page = get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1;
			if( 1 < $page )
				// Number of posts to show on subsequent pages (just grid)
				$query->set( 'posts_per_page', '4' );		
			else
				// Number of posts to show on first page (grid + features)
				$query->set( 'posts_per_page', '5' );
		}
	}
}
 
/**
 * Prepare the grid loop.
 *
 * Takes care of existing query arguments for the page e.g. if it's a category
 * archive page, then the "cat" argument is carried into the grid loop, unless
 * it's overwritten in the $grid_args.
 *
 * @author Gary Jones
 * @link http://dev.studiopress.com/genesis-grid-loop-advanced.htm
 * @uses genesis_grid_loop() Requires Genesis 1.5
 */
function child_do_grid_loop() {
	
	global $wp_query;
	//print_r( $wp_query );
 
    global $query_string, $paged;
 
    // Ensure the arguments for the normal query for the page are carried forwards
    // If you're using a Page to query the posts (e.g. with the Blog template), comment out the next line.
    wp_parse_str( $query_string, $query_args );
 
    // Create an array of arguments for the loop - can be grid-specific, or
    // normal query_posts() arguments to alter the loop
    $grid_args = array(
        'features' => 1,
        'feature_image_size' => 0,
        'feature_image_class' => 'alignleft post-image',
        'feature_content_limit' => 0,
        'grid_image_size' => 'grid-thumbnail',
        'grid_image_class' => 'alignleft post-image',
        'grid_content_limit' => 0,
        'more' => __( 'Continue reading &#x2192;', 'genesis' ),
        //'posts_per_page' => 3,
    );
 
    // Make sure the first page has a balanced grid
    /*
    if ( 0 == $paged )
        // If first page, add number of features to grid posts, so balance is maintained
        $grid_args['posts_per_page'] += $grid_args['features'];
    else
        // Keep the offset maintained from our page 1 adjustment
        $grid_args['offset'] = ( $paged - 1 ) * $grid_args['posts_per_page'] + $grid_args['features'];
 
 	*/
    // Merge the standard query for this page, and our preferred loop arguments
    genesis_grid_loop( array_merge( (array) $query_args, $grid_args ) );
 
}
 
/**
 * Add some extra body classes to grid posts.
 *
 * Change the $columns value to alter how many columns wide the grid uses.
 *
 * @author Gary Jones
 * @link http://dev.studiopress.com/genesis-grid-loop-advanced.htm
 *
 * @global array $_genesis_loop_args
 * @global integer $loop_counter
 * @param array $classes
 */
function child_grid_loop_post_class( $grid_classes ) {
    global $_genesis_loop_args, $loop_counter;
 
    // Alter this number to change the number of columns - used to add class names
    $columns = 3;
 
    // Only want extra classes on grid posts, not feature posts
    if ( $loop_counter >= $_genesis_loop_args['features'] ) {
 
        // Add genesis-grid-column-? class to know how many columns across we are
        $grid_classes[] = sprintf( 'genesis-grid-column-%s', ( ( $loop_counter - $_genesis_loop_args['features'] ) % $columns ) + 1 );
 
        // Add size1of? class to make it correct width
        $grid_classes[] = sprintf( 'size1of%s', $columns );
    }
    return $grid_classes;
}