Did you ever contact Artech about the armboard? Are you still using the orig. alum. armboard for the Phantom? Acording to Artech, the Phantom's 1100 g. weight is too heavy for use with the orig. armboard and you should get the newer acrylic one made specifiaclly for the Phantom's added weight. Have you noticed that the suspension is more easily set into motion with the Phantom?
When I first set up the Orbe+Graham I had three different armboards all marked Graham 2's. All three were different. One was actually for a SME arm and the others were for the Graham 2 differed in weight (and height) by 40 grams or more. I also have issues with the way the holes are drilled and my weights come in contact with the VTA pillar when I swing the arm back to the arm rest. I experimented with the rotaion of the arm base and the armboard holes and found that you could mount it so the VTA pillar was farther to the rear. Unfortunately, the SME style mount doesn't work that way.
When I first set up the Orbe+Graham I had three different armboards all marked Graham 2's. All three were different. One was actually for a SME arm and the others were for the Graham 2 differed in weight (and height) by 40 grams or more. I also have issues with the way the holes are drilled and my weights come in contact with the VTA pillar when I swing the arm back to the arm rest. I experimented with the rotaion of the arm base and the armboard holes and found that you could mount it so the VTA pillar was farther to the rear. Unfortunately, the SME style mount doesn't work that way.