Theme Function: Posts per page, & category exclude.

Hello!

I am having an issue getting my categories to be effectively hidden from the home page…

I’m not sure why the code isn’t working, but I think I might possibly have some coding conflict.

in my Theme Functions, I have the following:

function limit_posts_per_page() {
	if ( is_home() )
		return 9;
	else
		return 99; // default: 99 posts per page
}

And also:

add_filter('pre_option_posts_per_page', 'limit_posts_per_page');
function limit_posts_per_archive_page() {
	if ( is_category() )
		set_query_var('posts_per_archive_page', 99); // or use variable key: posts_per_page
}
add_filter('pre_get_posts', 'limit_posts_per_archive_page');

function my_home_query( $query ) {
  // not an admin page and is the main query
  if (!is_admin() && $query->is_main_query()){
    if(is_home()){
     //cat=-94, -158"."&posts_per_page=9
      $query->set('cat', -94, -158);
      $query->set('posts_per_page', 9);
    }
  }
}
add_action( 'pre_get_posts', 'my_home_query'
);

If anyone could help me with this, it would be greatly appreciated!

Thank you in advance!