Using Drupal 7 with APC, Varnish and Memcache, what bins to put in which cache?

Question

I'm optimizing a Drupal 7 website and I have varnish, memcache and APC all installed and working with their individual Drupal 7 modules. In my settings.php I have the $conf options below.

My question is to get better performance and have all these caches work together well, do I need to add more configuration options?

The module readme's usually assume a single cache system. Are there any tweks needed to get better performance out of running 3 separate caching backends?

// Add Varnish as the page cache handler.
$conf['cache_backends'][] = 'sites/all/modules/varnish/varnish.cache.inc';
$conf['cache_class_cache_page'] = 'VarnishCache';
// Drupal 7 does not cache pages when we invoke hooks during bootstrap.
// This needs to be disabled.
$conf['page_cache_invoke_hooks'] = FALSE;

$conf['cache_backends'][] = 'sites/all/modules/apc/drupal_apc_cache.inc';
$conf['cache_class_cache'] = 'DrupalAPCCache';
$conf['cache_class_cache_bootstrap'] = 'DrupalAPCCache';
//$conf['apc_show_debug'] = TRUE;  // Remove the slashes to use debug mode.

$conf['cache_backends'][] = 'sites/all/modules/memcache/memcache.inc';
$conf['cache_default_class'] = 'MemCacheDrupal';
$conf['cache_class_cache_form'] = 'DrupalDatabaseCache';