Tin makes a huge difference in any of the spoon molds, definitely the Flutter Jig. That flutter jig in saltwater is crazy effective anywhere I have used it.
I started using Tin on my Hammered Jig mold and Slab Spoon mold 25 years ago and I was buying it for $3.00 a pound in the form of scrap tubing. Now its between $18 and $20 a pound, but if you work out the cost compared to say, a Kastmaster, its still a small fraction of the cost.