SSL/TLS profile is only the TLS versions, not ciphers. Decryption Profile is for SSL Inbound and Forward Proxy applications, not mgmt of the PANW Firewall. There's also KB articles to strengthen SSH, but I couldn't find any for HTTPS, on the mgmt interface: https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u0000004OOQCA2&lang=en_US%E2