I currently use a Graham 2.2 and a Jelco 750, both of which should work well with the Gyrodec but there are many, many good arms out there. You might consider upgrading the arm cable if you haven't already dome it.
I prefered Zeta on the Linn LP 12 above FR-64 mainly because of weight. Though Zeta is also a 'heavy gun' . This 'factor' is related to the used springs. On Thorens 160 Super the Alphason HR 100 was a better match. Your own idea to send the arm to Johny of Origami is the best of all propositions. Your problem is the cart not the tonearm. The Ortofon Kontrapunkt C or Jubilee are much better. If you intend to experiment with MM carts then the Alphason is the best choice. On ebay the Zeta is slightly more expensive. I assume of course that the money issue is important.
I'm currently using an Ortofon Cadenza Black cartridge and it sounds wonderful on an Ortofon AS212S tonearm, not quite so good on an SME IV tonearm with an uncomfortable peaky treble. This is mounted on an SME 20/2 turntable.
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