Corey Seager flat out rakes with a @victussticks KS15, 34/32, his big brother Kyle's model. It's a slightly modified 318. According to Victus, the handle is just a touch thicker which helps balance it out.
Corey swings Ash and Maple, though WPW saw him swinging Maple. Unfortunately, Victus doesn't offer this model or the 318. You can still shop Victus at the link.