I just got my lift installed too. I have notice that when i am traveling on the free way going over 60 mph and i take my foot off the gas, i hear a grinding/vibration noise from the front right side of the VX.
I also put ome 912 and they did crank my torsion bar.
I'm taking my vx bake to them on Friday.
I'm pretty sure that im having the same problem as you.
It kind of suck because I'm scared to take my VX on the freeway : X