Try dosing silicate. With my uv pods explode when dosing silicate. Its a 90w uv.I think it destroys the bottom of the food chain which effects a lot of things you don't directly feed.
and perhaps a lot of people dont see the effect because they haven't sized the UV big enough and got the flow right so it can kill ich.
I dont strain my water through filters. I have 2 skimmers and some reactors.
Anyway I am happier since I removed it and the fun little things came back.