I have had Koetsu on my SME, Schroder, Ikeda etc. I have a lot of experience. I would suggest keeping your SME V and adding mas to the underside of the arm. I used Blue Tak. Koetsus are low compliance cartridges. Usually about a 10. You need an effective mass of about 20 plus gms to get it right. The difference will be huge. You can email me offline for more. Otherwise get a 12 inch Ikeda or maybe try the 12 inch SME if you have the 20/12. I think the 20/2 is the too small.
Which arm best for SME30-2?
I have an SME 30-2 with SME V and a Koetsu Blue Onyx. The Triplanar and Graham Phantom B44 are possible alternetives. Does anyone have any experience in this respsect. i.e. Triplanar or Phantom on an SME 30? The rest of my system is: Asthetix Rhea Signature (yes the new one), CJ CT5 and a pair of LP140Ms driving Guaneri Hommage speakers set on solid (250Lb) Marble columns. CD is vis dcs Elgar DAC, Purcell upsampler and Theta Jade transport. All interconnects are by LFD - Black widow for Rhea and Elgar to CT5 and Silcer Scorpion for SME to Rhea and CT5 to LP140Ms. Speaker wire is home brew. 1mm fine Silver wire (99.9% pure) threaded into Teflon sleeving and bi-wired.