It sounds like you already know what you’re doing since you run higher keys than I do. Perhaps you have friends or great guild to help? Or you choose your groups wisely? Either way, congrats.
I think there is little I could say that’d be beneficial to you other than use Swiftmend every time it’s up and always use all of your cooldowns and get into a rhythm or a routine of knowing when to use cooldowns, which you should always be rotating through during the dungeons.