Fallow is going to be the highest chance at eradicating the problem with 99.9% effectiveness. The .1 accounts for that "x" factor. All reef safe treatments are garbage. The two most effective solutions are copper and hyposalinity, with the former being more effective than the latter.
As for duration, Anything above 8 weeks is only going to improve aggregates regarding overall effectiveness. 6-8 is the general consensus. I've used 8 with great success.
The mixed results people experience are due to 99.9% user error with the .1 being attributed to some "x" factor of the parasite.
One thing to keep in mind is that the super long life cycles of the parasite are only witnessed in colder waters. The water temperature we use in our tanks rules this issue out.