I woukd definatly give the koetsu a serious tryout. I'm using a koetsu jade on a jmw 10 on a tnt. After reading all the negative stuff about vpi tonearms and koetsu my expectations were low but they work very well together in reality. Also remember the 10.5 will do even better as the bigger aszimith ring and side weights make it a better match with lower compliance cartridges like the koetsu.
I would try a few things though. You might benifit from using the 3 gram headshell weight to increase the effective mass of the arm (not needed with the heavier stone body jade).
Try using no damping or very little (recomended by Mike at VPI)
The standard loading recomendation for your solid state xono would 100 ohms but try higher ones as well, going up to 1000 ohms. You might favor the more open sound of the higher loading. If the koetsu doesn't do it for you, the xv1-s is a great choice. Good luck.
I would try a few things though. You might benifit from using the 3 gram headshell weight to increase the effective mass of the arm (not needed with the heavier stone body jade).
Try using no damping or very little (recomended by Mike at VPI)
The standard loading recomendation for your solid state xono would 100 ohms but try higher ones as well, going up to 1000 ohms. You might favor the more open sound of the higher loading. If the koetsu doesn't do it for you, the xv1-s is a great choice. Good luck.