Saving custom fields for WP_Query to retrieve

For future reference on this question. I solved my problem by updating my save routine to save each field to its own key. This does work much better since each fields is saved to its own corresponding key it makes retrieval from WP_Query much better

    /* check if this is an autosave and if YES then do nothing */
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
       return;

    /* Verify the nonce field of the meta box */
    if ( !wp_verify_nonce( $_POST['propdp_details_noncename'], plugin_basename( __FILE__ ) ) )
       return;

    /* Check if the user can edit the post and if NOT the return and do nothing */
    if ( !current_user_can( 'edit_post', $post_id ) )
       return;

    /* start my array object to hold all my data to save */
    $detailsData = array();

    /* run through $_POST to check for all matching keys and values */
    foreach($_POST as $key => $data) 
    {
        if($key == 'propdp_details_noncename')
        continue;
        if(preg_match('/^propdp_details/i', $key)) 
        {
            $detailsData [$key] = $data;                
        }
    }

    /* loop through all gathered keys and values to add, update and delete meta */
    foreach($detailsData as $meta_key => $new_value)
    {

        //get old value of meta key
        $curr_value = get_post_meta( $post_id, $meta_key, true );

        //check if old value exists and add if OLD NOT EXIST
        if($new_value && '' == $curr_value)
        {
            add_post_meta( $post_id, $meta_key, $new_value, true );
        }

        //check if old value == new value and update if NEW NOT EQUAL
        elseif($new_value && $new_value != $curr_value)
        {
            update_post_meta( $post_id, $meta_key, $new_value);
        }

        //check if new value exists and delete if NEW NOT EXIST
        elseif('' == $new_value && $curr_value)
        {
            delete_post_meta( $post_id, $meta_key, $curr_value);
        }

    }

This allowed me to use my WP_Query args array like this

$myQueryArr = array(
                    'post_type' => array('custom', 'post', 'types'),
                    'post_status' => 'publish',
                    'meta_query' => array(
                                     array(
                                      'key'=>'propdp_details_listing_agent',
                                      'value'=>$currentID
                                     )
                                    )                                           
              );