well, the 1.017 has worked for me, for over a year now. And my LR, its still alive and doing well. My FOWLR tank consist of one purple tang, one powder blue tang, one adult emporer angel, one fireball pseudo, and a few other fish that are not very acceptable to ick.
Maybe the salinity is key, maybe its not. Maybe its the everyday feeding of garlic soaked food, maybe its not. Maybe its quarantine of a fish for 30 days before it is allowed to enter my main tank, maybe its not. But regardless, then is what has worked for me, after numerous trials and errors.