Hi J-ed, you’re right, I was simply a little reluctant to change a configuration that I felt should work!
I confirm that, by configuring redis to listen on sock, and after changed config.php in that way:
//'memcache.local' => '\\OC\\Memcache\\Redis',
//'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
//'host' => 'localhost',
//'port' => 6379,
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
),
is it working fine 
Thank you!