Well, unless your name is "enry"... I wasn't speaking to you.
I know the difference between Fluoro mainline and leader material, the leader material is much tougher than the mainline! They put admixtures in the mainline formula to make it more supple so it won't be so stiff and will stay on your reel!
I'm a big fan of Seaguar and Suffix brand leader materials! I'm also a big fan of Vanish mainline!
If your line is breaking at the knot, you probably wetting/lubricating enough before you cinch the knot down. If your line is breaking elsewhere, you need to reconsider your drag setting!
If Vanish is a s bad as some people say, I wouldn't have been able to land this Striped Bass on 4 lb. test Vanish!