Milk spots are a bummer. It is my understanding that you can't get rid of them, but this is not my series. I don't know if PCGS has any gurantees on this stuff. I tend to doubt it, but you might ask.
I believe that the change in holder speeds up the spots. The proof half dollars in 1964 had the same problem. I understand the services can reduce the size of the spots but they will come back.
I still don't understood why "milk spots" have become such an issue on bullion coins. They never had issues when they minted them for circulation.
A “bullion coin” is not a bullion coin when it is Proof. Proof coins have value beyond the normal bullion premium. Proof coins have reputation for perfection or close to it. Therefore any imperfection is important and lowers the value of the coin.
