In any event, you got everything you need to know in your very first thread on this matter:
In today’s news, single target AA skill not hitting peak clear times in AoE-centric game mode and yet still manages a sub 8 minute time.
Buff it here and there if you want, but Cadence will never perform sub-6, lest main-game balance (which is Crate’s main selling point) be thrown entirely out of whack. That in mind, it’s questionable what you’re after.