When I use curly tails, it's always the 2" size with 1/16 oz. ball heads. I get my tails from Netcraft. Have been buying them there for 40 years. No issues. And they do catch fish. However, I would never use a curly tail suspended under a bobber. Curly tails are designed for movement, not a stationary presentation. I think, in that situation, you might be better off with a BGBS or similar straight tailed grub. JMO.