Sorting of coupons in the right way

I´m using custom post types on my site and i need to sort these coupons in this way:

1. New Coupon ending TODAY ---


2. New Coupon ending 05.03.2015


3. New Coupon ending 06.03.2015


4. New Coupon ending 07.03.2015


5. ---


6. Old Coupon expired 03.03.15


7. Old Coupon expired 02.03.15


8. Old Coupon expired 01.03.15

These coupons have a custom field named unixendet with unix values (tells when a coupon is ending) in it - F.x.: unixendet = 1428271200

Now i´m using this code for querying two lists in one:

<?php 
date_default_timezone_set('Europe/Berlin'); setlocale(LC_TIME, "de_DE", "german");
$time = current_time( 'timestamp' ); // Get current unix timestamp

$args = array(
    'post_type' => 'gutschein',
    'pagination'             => true,
    'posts_per_page'         => '10',
    'posts_per_archive_page' => '10',
    'ignore_sticky_posts'    => false,
    'post_status' =>  'published',
    'paged' => $paged,
    'meta_key' => 'unixendet',
    'meta_value' => $time, // Use the current time from above
    'meta_compare' => '>=', // Compare today's datetime with our event datetime
    'orderby' => 'meta_value_num',
    'order' => ASC,
);

// get results
$first_query = new WP_Query( $args );

$args2 = array(
    'post_type' => 'gutschein',
    'pagination'             => true,
    'posts_per_page'         => '10',
    'posts_per_archive_page' => '10',
    'ignore_sticky_posts'    => false,
    'post_status' =>  'published',
    'paged' => $paged,
    'meta_key' => 'unixendet',
    'meta_value' => $time, // Use the current time from above
    'meta_compare' => '<=', // Compare today's datetime with our event datetime
    'orderby' => 'meta_value_num',
    'order' => DESC,
);

$second_query = new WP_Query( $args2 );

$result = new WP_Query();
$result->posts = array_merge( $first_query->posts, $second_query->posts );
$result->post_count = count( $result->posts );

// The Loop
?>
<?php if( $result->have_posts() ): ?>
  <?php while ( $result->have_posts() ) : $result->the_post(); ?>

The big problem is how it outputs the posts:

I have 48 coupons: 11 valid ones from args1 AND 37 expired ones from args2

• first page: 10 coupons from args1 AND 10 from args2


• second page: 1 coupon from args1 AND 10 from args2


• third page: 0 coupons from args1 AND 10 from args2

---

• Problem 1: On the second page there is 1 valid coupon, so it would make no sense to sort like this. I want all valid ones stay above the expired ones.


• Problem 2: It seems that 7 coupons are missing from args2 (page number 4 doesn´t exist.) So only 30 from 37 expired posts are showing up.

Hope somebody can help.