Struggling with Wisteria — would appreciate advice

I want to be honest: I'm not getting great results with Wisteria and I'm not entirely sure why. pruning at the wrong time removing next season's flower buds has been a recurring problem despite my attempts to address it. I've been focusing on feeding with a high-potassium fertiliser in summer to encourage flowering based on everything I've read.

dramatic seasonal transformations from bare stems to full cover is there in glimpses, which tells me the plant has potential in my conditions. I have it in a house wall with appropriate fixings for support which might not be ideal. bud break and rapid early growth in spring showed some improvement. Two stars for now — not the plant's fault, but not a success yet. I'll update if things improve.