Anyone elses Violas/Pansies struggling this year?

[zb]

Last years plants (4 off), overwintered them in a cold frame, seemed to bounce back OKish early spring, stems bit pale but plenty flowers, which I've dead headed often. Past few weeks they're really struggling, one in particular is practically straw when I checked it there.

I've kept them watered, anti-fungal, insecticide added, and tried a few times with plant food. Soil is moist, no sign of root rot, I do let them dry out a bit, I don't keep them damp. I also have copper tape wound round the pots, so no slugs.

I'm mirroring exactly what I did last year with no luck, don't really want to put them back in the frame, kind of defeats the purpose of having them.

Anyone else?