Crank pulley out of balance

[Sport35Driver]

So I revved the car the other day to redline and afterwards heard a weird noise. It was as if something was out of balance. I didn’t think anything of it as it’s been driving fairly normal since and no noise. I was fixing a fog light when I noticed oil collected in the center of the undertray. I removed the tray and found that the seal behind the pulley was wet with oil and oil was sprayed against the front cover and the sway bar and other components. I started the car to see if I could see it spraying from behind there. I noticed the pulley wobbling out of balance right away. Not terribly but enough to cause the pulley to cause a small leak with the seal. When I swapped the motor a couple years ago, I want to say I was able to torque the bolt on the pulley to spec but maybe not? It’s down almost to low on the stick in a couple days of it happening.

Any chance it’s the crank itself wobbling and not the pulley? I want to take it to the dealer at this point but also don’t want to get raped. Anyone have any ideas?

The dealer said they wear out sometimes and need to be replaced. He said there's rubber that could have deteriorated and cause it to come out of balance. This is the original crank pulley from my old motor so it's at 105k right now. They quoted me 2 hours of labor and potentially a new pulley which is $320 their cost.