It seems like the evs are the biggest issue here...
The currently listed 136 HP / 124 Def / 248 SpD spread was Honcko's spread, that I played around with to get a bit more defensiveness on both sides, the difference is probably negligible, but its there.
I personally thing the currently listed set is the more efficient, as it secures many 4 HKOs on special attacks which is needed with rest. While playing around with the curse set, I found the only way they can take you down forcibly, is raw special power, and the whirlwind still enjoys the special bulk for the same reasons.
No luck involved sets seems solid though, you only lose a slim chance or some 4HKOs which turn into 3HKOs, which is negligible. Also being able to survive Sharpedo's crunch is very pleasing too.
Molten Kyurem's set finally seems to be most physically bulky, about 3% more bulky then No Luck Involved's spread, and about 1% less specially bulky. That 1% special bulk difference will actually get you a few times.
There might be some more efficient spread between the 2, but at the moment I can't be bothered in finding it. I would be interested to see what the QC team says about this.
VM me for a RMT rate if your team is defensive. I am not Scarf Wynaut on Pokemon Showdown.