As I understood it the 6000v caps are NOS but still quite old, Is that correct?
Mike, I will send you a couple of fresh .005@6000v caps to try.
Meanwhile you could do as Steve suggests and switch those caps around and see what happens.
A word of to the wise Mike, if you have to choose between my advice and Steve McVoys go with his
I am just a humble parts changer for the most part while he is the wizard.
Eric