With the bolt removed, how much of the crank snout is visible in the balancer's bore? IOW, how deep in the bore is the end of the crank snout?
3/8"
I would expect to see less.
Measure the distance from the shoulder on the crank snout where the balancer bottoms out to the end of the snout. Compare that to the depth of the bore in the balancer to be sure it's actually bottoming out on the shoulder.
