You will do a series of small water changes, taking 5-10% of the water out and replacing it with freshwater (5% would not be as aggressive as 10%). Do this over the course of the next week. This should get your salinity down to 1.016 (it might take a day or two, more or less). When the water is down to 1.016, I have heard that small water changes are necessary to pull out the free-swimming ich (I do not know how true or accurate that is). Either way, I would keep the salinity in that range for the better part of a month, at the end of which you will increase the salinity in the same manner. Change 5-10% of the water daily with 1.026 water until you are back at your desired range.
About the increasing of the water temperature. I have heard that increased water temperature will speed up the life cycle of the ich parasite. I do not know if I would subject the already stressed fish to higher water temperatures than 80-82 degrees, but that is up to you.
Start running that UV as it will kill a lot of the free-swimming ich parasite, which will help in controlling the issue.