Yea, I have also been told to not go under .008 due to I think liver problems with the fish?
If started on the 23rd and we are on may 5 now, you haven't even hit two weeks yet.
Dropping the salinity lower then their bodies can take will not make the ich go away faster allowing you to sell quicker.... If you wanted the fastest way I would of used copper, its a month treatment vs 6-8 weeks for hypo treating. Messing with salinity to much will kill them....