The sticky tack increases spin, but the changes to the ball act as a multiplier. Bigger seams make the increased spin more effective; reduce coefficient of res

The sticky tack increases spin, but the changes to the ball act as a multiplier. Bigger seams make the increased spin more effective; reduce coefficient of restitution makes a mistake less costly (so pitchers can take more strategic risks). TLDR, it's a multiplier on the spin rate issue.