Koetsu Jade v SPU classic v FR 7 fz cartidges


Greetings to all !
I am hoping to get some advice concerning my analogue set up.
I use a Brinkmann La Grange turntable with a FR 66s tone arm.
I bought the FR 66 as a high mass "match" for my Koetsu Jade cartridge which has just been fully rebuilt by Koetsu with diamond cantilever.
The rest of the system is Allnic H 3000 phono stage , Allnic L 5000 line stage, Aklnic A 6000 monoblocks and Quad 2905 speakers / Audiophysic Rhea 2 subwoofers (pair).
I listen to a lot of choral classical music and for this the midrange needs to be really " organic" and free from any harshness or glassiness and , very importantly, the cartridge needs to track demanding loud and complex passages properly.
In this latter regard I am not 100% convinced by the Koetsu. It has been professionally installed in the FR 66 using proper alignment tools and is mounted in an Orsonic headshell. Yet to my ears it gets " nervous" in certain demanding passages of music .
I have tried increasing the VTF to 2.5 grams (the maximum recommended is apparently 2.2 gm ?) and this does seem to improve things but I assume that this will have som negative effects given it is some way over the " limit".
I just bought a " standard" SPU Classic (with spherical stylus) in the integrated headshell and, tracking this at 4 gm, I was instantly bowled over by the " organic" midrange in the type of music referred to above.
After a series of "A/B" comparisons with the Koetsu I am struggling to say I really prefer the Koetsu to listen to in my system , although it clearly has greater frequency extremes, transparency and detail than the basic SPU ( it costs over ten times as much !!)
I was wondering if anybody out there has had similar experiences with Koetsu stone bodied cartridges ?
I am now thinking of going for one of the FR 7 cartridges ( fz version) and again would welcome any comments on this and how it might compare to the Koetsu / SPU ?
With kind regards,
Howard
128x128howardalex

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Hi I also use FR-66s with Koetsu Stone Bodies and also own FR-7fz but in my Set up I have no problem running even trough most demanding classic tracks and my max VTF with Koetsu is 1.80gr.
Any SPU is absolutely mediocre compared to those in general Performance. It is a midrange pusher and here it shines but from overall Performance it is no comparison. A 7fz is a total different chapter, when you can get one, do it.
Just a question:
When you turn the VTF knob, do you need some force, do you hear clicks when you pass the 1.0, 1.5, 2.0, 2.5 signs?