I’m planning for a potential cartridge upgrade and I wonder if someone would have any experience with the Koetsu Rosewood Signature Platinum used with a Kuzma 4Point 9 tonearm? From what I’ve heard all Koetsus (and the non-stone versions in particular) prefer heavier mass tonearms. The Kuzma 4Point 9 tonearm has an effective mass of 13g (which means it isn't that heavy). I also understand that the weight of the Koetsu Rosewood Signature Platinum isn’t 9g as most web sites seem to say, it’s supposed to be 12,8g. Are there other “comparable” cartridges that you believe would fit the Kuzma 4Point 9 tonearm better than the Koetsu Rosewood Signature Platinum?