Remove post and page columns from Smartcrawl

Hi There,
I'm trying to hide the columns created on the post and page tables in wp-admin created by Smartcrawl. In particular, robots meta and title tag.
I have added this code to a custom plugin:

function remove_pages_columns($columns) {
  // Remove checkbox column
  unset($columns['page-title']);

  return $columns;
}
add_filter('manage_pages_columns', 'remove_pages_columns');

function remove_post_columns($columns) {
  // Remove the checkbox
  unset($columns['page-title']);

  // Remove the Author
  unset($columns['page-meta-robots']);

  return $columns;
}
add_filter('manage_posts_columns', 'remove_post_columns');

But it doesn't have any affect - is there another way to achieve this?