Not sure on the stance reset other than the delay that has always been there when doing multiple heavy sword attacks. But it does sound like you are getting from the hiding spot to crota a little slow to be most effective you should have either be slashing in as rockets hit or trying to get your first smash as he begins to go down to kneel (mid kneel animation for most effectiveness)
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Thanks, me and my friends are gonna give it another try after I get outta work so I'll give sword duty another go