Sounds like balancer slipped to me. Even though you have a balanced assembly you can bolt on a new factory or aftermarket, like Pioneer. Any of the "race" balancers are up there in price.
Also, on the balancer, you should be able to have the new one balanced the same as the old one, without going through all the components again.
On the valve adjustment. Crane says 1/2 to 1 turn. You can get their info at
www.Cranecams.com