Just keep at it, you'll get it eventually
I myself like fishing for stendels a lot, just the feeling when you catch a bane, excitement before opening it, and the rush when you finally manage to get it. Feels amazing.
Fished up around 20 of them rings, ranging from +5k casts and +40 banes to 84 casts anf 1 bane before getting one. It's worth getting it imo, maybe not bis for your primary set, but it's definitely a cool item to have.
PS TI veteran mfkers