LB.... if I'd known you've never tried a VS339, I've got a couple of them here. I'd have sent ya one long ago.
But, methinks the X flex might have been a bit stout for ya, as would the XXX ones I've got in a black DCT, a bright Kelly (Irish) green, TK1 and in my Bangster 3wd.
I'd have to say the VS339 is probably my favorite shaft, closely followed by the original Assassin LD, and the stout-as-a-mofo Grafalloy Blue LD!