Are you feeding their favorite frozen foods, boosted with garlic and or a vitamin additive (like selcon). I think that's at least as important as the treatment you're doing.
Why do you desperately need to do a water change? If it's a water quality issue, I'd give that priority over your Kick Ich treatment protocol. The most important thing is that the tank is as stable and healthy a place as possible so these sick fish can get better.