Why would you take the Vortex Ring when you can penta-meld an HQ Gryphonskin? On mine, I put VIT IV, 2x Savage Aim III, 2x Savage Might III. That gives my ring

DEX 9
Accuracy 12
Skill Speed 9
VIT 8
Crit 12
Det 8

I would have thought the loss of 4 DEX is more than offset by gaining a point of Crit and 8 points of Determination. Plus, the 12 Accuracy on this allows me to take better choices in other slots, like Bard's Chapeau over Allagan Visor of Aiming. Now, I'm gaining another 6 points of Crit without sacrificing any accuracy (I'm actually still up 6 points of Accuracy). I haven't played around too much with the other slots, but HQ Gryphonskin still seems to be a BiS to me.