we're a lot like you in that we're probably nowhere near clinical enough when it comes to culling- prob why we don't make much money out of our sheep- though we did cull one last year who had permanent foot problems. we hadn't had her very long so it was easier as we hadn't got particularly attached. i'm a firm believer in trying to ensure that I pay attention to dietary needs. I know that zinc is crucial to hoof hardness and health so always ensure that the mineral blocks I use are high in zinc. I use euroblocs- calseagrit zinc block which I get on fine with though it does dissolve easily in the rain so I built a little roofed area to keep it in. I do work for mole valley farmers who sell them so I get them at a reasonable rate, but would recommend for a good range of trace elements as well as sodium, vital for rumen health. I only use buckets at tupping time and in the run up to lambing when I feel they prob need a bit more energy as they are largely a bucket of sugar