Yes it is frustrating however it does not take a gcd to turn off shield oath which you can weave between your skills, for example. During the pld opener or anywhere during the fight you can do your hate combo then do your Fast Blade-Savage Blade-(turn off shield oath)Royal Authority combo. If you have desant ping you could also double weave shield oath+fight or flight for max dmg. Remember turning on sword oath only increases auto attack dmg.