Display posts in custom query with one post form

I am trying to first display four posts with post-format-aside (all assigned to current tag) and then display the “real” archive (exclude post-format-aside) for the specific tag.
Right now I am using a function to exclude post format-aside from the main query:

add_action('pre_get_posts', 'keyl_get_emp_posts');
function keyl_get_emp_posts($query) {
if (is_tag()) {
    if ($query->is_main_query())
     $taxq = array(
        'tag' => $current_tag,
        array(
            'taxonomy' => 'post_format',
            'field' => 'slug',
            'terms' => array(
                'post-format-aside'
              ),
            'operator' => 'NOT IN'
        )
    );

        $query->set('tax_query',$taxq);
    }

}

Than I am trying to display the custom query with only post-format-aside with

<div class="row">
	<?php $current_tag = single_tag_title("", false);
	$args = array(
		'posts_per_page' => 4,
	    'tag' => $current_tag,
	    'post_type' => array('post', 'renvoeringsdamm'),
		'tax_query' => array(
			array(
				'taxonomy' => 'post_format',
				'field' => 'slug',
				'terms' => array( 'post-format-aside' )
			)
		)
	);
	$query = new WP_Query( $args );

	if ( $query->have_posts() ) {
	  while ( $query->have_posts() ) {
	    $query->the_post(); ?>
	    <div class="col-sm-3 col-xs-6">
	        <?php get_template_part( 'content', get_post_format() ); ?>
	    </div>
	    <?php
	  }
	      wp_reset_postdata();
	} ?>
	</div>

But the special query for only post-format-aside is displaying post from all types of post-formats… So my question is really, what is wrong with what I have done so far!..