HTML vs PlainText

As per a previous thread I have a function to force HTML emails to be used with the plugin. Works like a charm, except for some plaintext emails.

It strips out the line spaces when a plaintext email is sent. Is there any way to only have it strip spaces out of HTML emails?
This is what my plaintext emails look like:
http://screencast.com/t/3BKO9iYm1E

Here is the function:

add_action( 'init', 'wpbe_wpmandrill_compatibility_init' );

function wpbe_wpmandrill_compatibility_init() {
	global $wp_better_emails;

	remove_filter( 'mandrill_payload', array($wp_better_emails, 'wpmandrill_compatibility') );

	// do your own email processing
	add_filter( 'mandrill_payload', 'wpbe_wpmandrill_compatibility' );
}

function wpbe_wpmandrill_compatibility( $message ) {

    global $wp_better_emails;

    // make sure you have the %content% tag in the template
    if ( $wp_better_emails->check_template() ) {
        // clean < and > around text links in WP 3.1
        $message['html'] = $wp_better_emails->esc_textlinks( $message['html'] );
        // make links out of URLs
        $message['html'] = make_clickable( $message['html'] );
        // set template
        $message['html'] = $wp_better_emails->set_email_template( $message['html'] );
        // replace variables
        $message['html'] = apply_filters( 'wpbe_html_body', $wp_better_emails->template_vars_replacement( $message['html'] ) );
    }

    return $message;
}

Any help is appreciated! Unfortunately, there is no way to make the plugin using plaintext send HTML hence I need to find a solution for this if possible.

https://wordpress.org/plugins/wp-better-emails/