Perhaps air bubbles are getting trapped between the outside of the chimney and the inside of the tank, it is kinda narrow there maybe screwing it down is releasing them?
I think you'll be lucky to find someone with a polished topcap and no fill holes who's looking for one with the holes.... I asked Aiolos for one without the holes and he sent me one with my last order, you may have to go down that route.
I think the Phenom looks really great without the top...
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