Given the track record of previous relics, it was a bit optimistic to assume that stage two of the Eureka weapons would be as easy as stage one was. The previous relics typically had a bump up in grindiness at each stage - sometimes a substantial bump.
I expected that, at a minimum, Pagos would require killing the zone boss three times rather than just once to get all the items needed for the upgrade. It doesn't surprise me in the least that the actual grind is even worse than that expectation.
