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?
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?