I have been tying nymphs on 1/124 oz. jigs (size 10 hook) for a few years with some success in the end product. They cast okay and I use them to sink a dropper soft hackle or another nymph typically. I hate the way split shot cast but have been thinking of going to 1/80 or 1/64 oz. jig heads, maybe even 1/32 oz. What are you using and how does it cast.