Not only a thin blank matters at stickbait speed, but don't forget about the hook. In the spring when running at stickbait speed, I will remove trebles and replace the hook with a small siwash single. Vibrax spinner replacement hooks work good.
http://www.greentackle.com/catalog/product/view/id/123/s/gamakatsu-siwash-hooks/category/4/