Custom product loop excluding values with same name

Hello, I need to hide products with same title from WooCommerce shop page so i created a loop which is working and does hide products with same name but i have a problem.

If i set posts_per_page=8 it shows less because it counts the hidden products also.

<?php
$args = array('post_type'=>'product','posts_per_page'=>8);
$query =new WP_Query($args);
$list = array();

while($query->have_posts()): $query->the_post();if(in_array(get_the_title(), $list)){continue;}
$list[]=...

Code (markup):

Custom product loop excluding values with same name

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