Koetsu compliance compatibility issues

I'm using a koetsu jade with a VPI JMW-10 on a TNT turntable.
On paper the JMW-10 is a poor match for the jade as it's a unipivot with effective mass is in the 10-11gm range. That being said it sounds awfully good to me. Would an arm with a higher effective mass sound better? Maybe and one day I plan on finding out but for now the combo sounds great regardless of the math formulas.
A few things to consider, the stone body koetsu by being heavier by around 4gms then their wood/urushi counterparts and thus increase the effective mass of the arm their used with.
The effective mass of an arm can be increased by adding a cartridge weight. I know that VPI sells a 3gm aluminum weight for this purpose and I've seen a 5gm brass head shell weighs available.
Additionally by using a LIGHTER counterweight further back on the arm as opposed to a heavier counterweight closer to the pivot point will also increase the effective mass.
Just my 2 cents.

Well, this not an area of expertice but the effective mass is the moment of inertia and the further from the pivot point wheather the cartridge or counter weight increases the moment of inertia and hence the effective mass.
In your formula the F would appear to be the VTF thus the larger the D for any given VTF the higher the effective mass/moment of inertia.
There's a nice discussion of the topic by AJ Conti on the Basis website in the Vector tonearm section were he discusses changes in effective mass with using one or two counter weights and their relative positions on the arm.
Most importantly, happy listening and enjoy the music.