Howard, you need to try an FR headshell - you can find them on eBay. The Koetsu is too heavy and too low in compliance for an Orsonic.
You can occasionally find an FR-7f or fz on eBay but they are rare and go for $2500+. Well worth the effort if you can find one.
I disagree with Syntax on the Ortofon SPU's - they are marvelous cartridges on the right arm and for the right music - namely classical and orchestral. The FR-64 and 66 were MADE for these cartridges. I don't think your experience is a fluke. I'd try a newer one like the Synergy or the 95th Anniversary one which is an A90 electrical design with an elliptical stylus and the SPU body. In an FR-66 it will compete with anything out there.
You can occasionally find an FR-7f or fz on eBay but they are rare and go for $2500+. Well worth the effort if you can find one.
I disagree with Syntax on the Ortofon SPU's - they are marvelous cartridges on the right arm and for the right music - namely classical and orchestral. The FR-64 and 66 were MADE for these cartridges. I don't think your experience is a fluke. I'd try a newer one like the Synergy or the 95th Anniversary one which is an A90 electrical design with an elliptical stylus and the SPU body. In an FR-66 it will compete with anything out there.