Koetsu cartridges - what arms work?

I had a Classic Red and a RSP on the Da Vinci Grandezza arm. It worked great. I also had the Classic on a Linn Lp12 with Ekos arm and it worked very well also.

I have the new VPI prime scout. 
JMW 9 unipivot arm. Sounds sublime. 

Does anyone know if this is technically a match? 

Why not take an empirical approach, begin with a low mass arm, and measure the cartridge/arm resonant frequency, and add mass to the arm as needed until you hit the optimal range of 9Hz to 10Hz?

@johnhaines

I never forgot that Koetsu midrange . I am wondering about the arm match. I certainly will not back cue or scratch, it’s just for playback. I do want the ability to swap headshells.

Much like David Mancuso (RIP) who DJ’ed with pair of Koetsu. Are you gonna use two? Where on earth you have a place to spin records on public with set up deserved Koetsu quality (apms, speakers etc), in Japan?

So far the best tonearm (especially, but not only for Koetsu)
is the ViV Rigid Float.

In my system this beast has beaten all conventional tonearms
so far including classic 12", DaVinci, Graham, Reed and others.