Initial timing set @ 30*. Engine seems happy?

The balancer hub is keyed to the crank. That does not stop the outer inertia ring from slipping on the hub if the rubber ring is old, deteriorated or otherwise defective. That's why you were advised to check TDC. 30* initial is a gob of timing. Way too much, unless you have it locked out....even then not a great idea for a street car.