More water agitation, like you're already doing, is good since you're helping to get more oxygen into the water. Warmer water holds less oxygen.
At 84-86 degrees the ich will multiply rapidly and you'll see more spots. At 87-88 degrees the ich dies off and probably within 2-3 days you'll see the spots visible on the fish decrease noticeably. But the ich spots on the fish are only one stage of the ich parasite - they are also free-swimming in the water and they fall to the substrate and encase themelves to reproduce. You can't see the free-swimming stage or the reproductive stage. So to make sure all the ich are killed in all the stages of their life cycle, you need to keep the temperatures up at 87 or 88 degrees for two weeks after the last spot goes away. So the temperature may be at 87 or 88 degrees for a total time of up to three weeks. Adding an extra week, like kamo87 suggests, probably won't hurt and may be a good idea to make sure all the ich is gone in a large tank. When you do decrease the temperature, do it gradually - 1 degree every 12 hours - to avoid stressing the fish.
Don't pull the clown loach out of the big tank - he needs to be in the warmer water to kill the ich on him. If you put him in another tank, you'll have to increase the temp. in that tank too to combat the ich in all three stages. Often it is best to take a sick fish out of the community tank and treat in a QT tank but since ich has three stages and heat kills all three, it's best to leave all fish with ich in the same tank.