Just because the spots on the fish are gone, don't stop treatment. There are cysts that are sitting in the substrate ready to hatch out. And it is only the freeswimming ich tomites that are killed by salt.
When ich spots dissappear, it means the spot has exploded into hundreds of immature ich that are headed into the substrate to sit temporarily dorment.
3ppt (part per thousand) salt and above is the dose that works and kills the ich as it explodes from the fish, or hatches out from the substrate.
I also just add rock salt by the handful to HOBs, or tossed in a sump and found it to be effective.
I'd keep the temp and salinity up for at least a month, to kill the dormant ones that can and will hatch out over time.
Your Uaru should be fine with the elevated temps, in fact some people recommend keeping them in the high 80s as normal routine.